749680921 has 8 divisors (see below), whose sum is σ = 822117888. Its totient is φ = 677958000.

The previous prime is 749680913. The next prime is 749680927. The reversal of 749680921 is 129086947.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 749680921 - 2³ = 749680913 is a prime.

It is a super-2 number, since 2×749680921² = 1124042966622816482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (749680927) 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, 176310 + ... + 180511.

It is an arithmetic number, because the mean of its divisors is an integer number (102764736).

Almost surely, 2^749680921 is an apocalyptic number.

It is an amenable number.

749680921 is a deficient number, since it is larger than the sum of its proper divisors (72436967).

749680921 is a wasteful number, since it uses less digits than its factorization.

749680921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357023.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 749680921 is about 27380.3016966578. The cubic root of 749680921 is about 908.4314325794.

The spelling of 749680921 in words is "seven hundred forty-nine million, six hundred eighty thousand, nine hundred twenty-one".