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7913997 = 337133221
BaseRepresentation
bin11110001100001000001101
3112220001222000
4132030020031
54011221442
6441342513
7124160610
oct36141015
915801860
107913997
1145159a3
122797a39
131841250
1410a0177
15a64d4c
hex78c20d

7913997 has 32 divisors (see below), whose sum is σ = 14434560. Its totient is φ = 4173120.

The previous prime is 7913989. The next prime is 7914019. The reversal of 7913997 is 7993197.

It is not a de Polignac number, because 7913997 - 23 = 7913989 is a prime.

It is a nude number because it is divisible by every one of its digits.

7913997 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7913947) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 847 + ... + 4067.

It is an arithmetic number, because the mean of its divisors is an integer number (451080).

Almost surely, 27913997 is an apocalyptic number.

It is an amenable number.

7913997 is a deficient number, since it is larger than the sum of its proper divisors (6520563).

7913997 is a wasteful number, since it uses less digits than its factorization.

7913997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3250 (or 3244 counting only the distinct ones).

The product of its digits is 107163, while the sum is 45.

The square root of 7913997 is about 2813.1827171373. The cubic root of 7913997 is about 199.2807246492.

The spelling of 7913997 in words is "seven million, nine hundred thirteen thousand, nine hundred ninety-seven".

Divisors: 1 3 7 9 13 21 27 39 63 91 117 189 273 351 819 2457 3221 9663 22547 28989 41873 67641 86967 125619 202923 293111 376857 608769 879333 1130571 2637999 7913997