73904921 has 4 divisors (see below), whose sum is σ = 73926144. Its totient is φ = 73883700.

The previous prime is 73904891. The next prime is 73904923. The reversal of 73904921 is 12940937.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 73904921 - 2¹⁰ = 73903897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73904923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4025 + ... + 12806.

It is an arithmetic number, because the mean of its divisors is an integer number (18481536).

Almost surely, 2^73904921 is an apocalyptic number.

It is an amenable number.

73904921 is a deficient number, since it is larger than the sum of its proper divisors (21223).

73904921 is a wasteful number, since it uses less digits than its factorization.

73904921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21222.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 73904921 is about 8596.7971361432. The cubic root of 73904921 is about 419.6537603748.

The spelling of 73904921 in words is "seventy-three million, nine hundred four thousand, nine hundred twenty-one".