745773921 has 12 divisors (see below), whose sum is σ = 1133925520. Its totient is φ = 471015000.

The previous prime is 745773907. The next prime is 745773929. The reversal of 745773921 is 129377547.

745773921 is a `hidden beast` number, since 74 + 577 + 3 + 9 + 2 + 1 = 666.

It is not a de Polignac number, because 745773921 - 2¹⁹ = 745249633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (745773929) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2180455 + ... + 2180796.

Almost surely, 2^745773921 is an apocalyptic number.

It is an amenable number.

745773921 is a deficient number, since it is larger than the sum of its proper divisors (388151599).

745773921 is a wasteful number, since it uses less digits than its factorization.

745773921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4361276 (or 4361273 counting only the distinct ones).

The product of its digits is 370440, while the sum is 45.

The square root of 745773921 is about 27308.8615837424. The cubic root of 745773921 is about 906.8505710399.

The spelling of 745773921 in words is "seven hundred forty-five million, seven hundred seventy-three thousand, nine hundred twenty-one".