745903921 has 8 divisors (see below), whose sum is σ = 869859200. Its totient is φ = 639345924.

The previous prime is 745903909. The next prime is 745903931. The reversal of 745903921 is 129309547.

It is not a de Polignac number, because 745903921 - 2⁵ = 745903889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (745903931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1086981 + ... + 1087666.

It is an arithmetic number, because the mean of its divisors is an integer number (108732400).

Almost surely, 2^745903921 is an apocalyptic number.

It is an amenable number.

745903921 is a deficient number, since it is larger than the sum of its proper divisors (123955279).

745903921 is an equidigital number, since it uses as much as digits as its factorization.

745903921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2174668 (or 2174654 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 745903921 is about 27311.2416598001. The cubic root of 745903921 is about 906.9032607007.

The spelling of 745903921 in words is "seven hundred forty-five million, nine hundred three thousand, nine hundred twenty-one".