74405491 has 4 divisors (see below), whose sum is σ = 74463984. Its totient is φ = 74347000.

The previous prime is 74405479. The next prime is 74405497. The reversal of 74405491 is 19450447.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74405491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74405497) 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, 27295 + ... + 29896.

It is an arithmetic number, because the mean of its divisors is an integer number (18615996).

Almost surely, 2^74405491 is an apocalyptic number.

74405491 is a deficient number, since it is larger than the sum of its proper divisors (58493).

74405491 is a wasteful number, since it uses less digits than its factorization.

74405491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58492.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 74405491 is about 8625.8617540510. The cubic root of 74405491 is about 420.5990902485.

The spelling of 74405491 in words is "seventy-four million, four hundred five thousand, four hundred ninety-one".