747198921 has 64 divisors (see below), whose sum is σ = 1247559680. Its totient is φ = 388177920.

The previous prime is 747198919. The next prime is 747198961. The reversal of 747198921 is 129891747.

It is not a de Polignac number, because 747198921 - 2¹ = 747198919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (747198901) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2387061 + ... + 2387373.

It is an arithmetic number, because the mean of its divisors is an integer number (19493120).

Almost surely, 2^747198921 is an apocalyptic number.

It is an amenable number.

747198921 is a deficient number, since it is larger than the sum of its proper divisors (500360759).

747198921 is a wasteful number, since it uses less digits than its factorization.

747198921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566.

The product of its digits is 254016, while the sum is 48.

The square root of 747198921 is about 27334.9395645939. The cubic root of 747198921 is about 907.4277968494.

The spelling of 747198921 in words is "seven hundred forty-seven million, one hundred ninety-eight thousand, nine hundred twenty-one".