746851921 has 4 divisors (see below), whose sum is σ = 751864500. Its totient is φ = 741839344.

The previous prime is 746851879. The next prime is 746851927. The reversal of 746851921 is 129158647.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 129158647 = 67 ⋅1927741.

It can be written as a sum of positive squares in 2 ways, for example, as 426835600 + 320016321 = 20660^2 + 17889^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-746851921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (746851927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2506066 + ... + 2506363.

It is an arithmetic number, because the mean of its divisors is an integer number (187966125).

Almost surely, 2^746851921 is an apocalyptic number.

It is an amenable number.

746851921 is a deficient number, since it is larger than the sum of its proper divisors (5012579).

746851921 is a wasteful number, since it uses less digits than its factorization.

746851921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5012578.

The product of its digits is 120960, while the sum is 43.

The square root of 746851921 is about 27328.5916395265. The cubic root of 746851921 is about 907.2873049436.

The spelling of 746851921 in words is "seven hundred forty-six million, eight hundred fifty-one thousand, nine hundred twenty-one".