74856409 has 4 divisors (see below), whose sum is σ = 78796240. Its totient is φ = 70916580.

The previous prime is 74856349. The next prime is 74856443. The reversal of 74856409 is 90465847.

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 74856409 - 2⁷ = 74856281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74856449) 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, 1969887 + ... + 1969924.

It is an arithmetic number, because the mean of its divisors is an integer number (19699060).

Almost surely, 2^74856409 is an apocalyptic number.

It is an amenable number.

74856409 is a deficient number, since it is larger than the sum of its proper divisors (3939831).

74856409 is a wasteful number, since it uses less digits than its factorization.

74856409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3939830.

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 74856409 is about 8651.9598357829. The cubic root of 74856409 is about 421.4470288465.

The spelling of 74856409 in words is "seventy-four million, eight hundred fifty-six thousand, four hundred nine".