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7975689421 = 71139384203
BaseRepresentation
bin1110110110110001…
…10101110011001101
3202120211200000001111
413123120311303031
5112313234030141
63355230412021
7401434145560
oct73330656315
922524600044
107975689421
113423083567
121667061011
139a14b096b
1455937a4d7
1531a2e7381
hex1db635ccd

7975689421 has 4 divisors (see below), whose sum is σ = 9115073632. Its totient is φ = 6836305212.

The previous prime is 7975689391. The next prime is 7975689431. The reversal of 7975689421 is 1249865797.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1249865797 = 1390389899.

It is a cyclic number.

It is not a de Polignac number, because 7975689421 - 25 = 7975689389 is a prime.

It is a super-2 number, since 2×79756894212 (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7975689431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 569692095 + ... + 569692108.

It is an arithmetic number, because the mean of its divisors is an integer number (2278768408).

Almost surely, 27975689421 is an apocalyptic number.

It is an amenable number.

7975689421 is a deficient number, since it is larger than the sum of its proper divisors (1139384211).

7975689421 is a wasteful number, since it uses less digits than its factorization.

7975689421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1139384210.

The product of its digits is 7620480, while the sum is 58.

The square root of 7975689421 is about 89306.7154305879. The cubic root of 7975689421 is about 1997.9720628471.

The spelling of 7975689421 in words is "seven billion, nine hundred seventy-five million, six hundred eighty-nine thousand, four hundred twenty-one".

Divisors: 1 7 1139384203 7975689421