749023021 has 8 divisors (see below), whose sum is σ = 758324160. Its totient is φ = 739741728.

The previous prime is 749022971. The next prime is 749023027. The reversal of 749023021 is 120320947.

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 749023021 - 2⁹ = 749022509 is a prime.

It is a super-2 number, since 2×749023021² = 1122070971975932882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (749023027) 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, 79840 + ... + 88726.

It is an arithmetic number, because the mean of its divisors is an integer number (94790520).

Almost surely, 2^749023021 is an apocalyptic number.

It is an amenable number.

749023021 is a deficient number, since it is larger than the sum of its proper divisors (9301139).

749023021 is an equidigital number, since it uses as much as digits as its factorization.

749023021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9923.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 749023021 is about 27368.2849480927. The cubic root of 749023021 is about 908.1656164002.

Adding to 749023021 its reverse (120320947), we get a palindrome (869343968).

The spelling of 749023021 in words is "seven hundred forty-nine million, twenty-three thousand, twenty-one".