74399440 has 40 divisors (see below), whose sum is σ = 182086560. Its totient is φ = 28192896.

The previous prime is 74399431. The next prime is 74399441. The reversal of 74399440 is 4499347.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 74399393 and 74399402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74399441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22954 + ... + 25993.

It is an arithmetic number, because the mean of its divisors is an integer number (4552164).

Almost surely, 2^74399440 is an apocalyptic number.

It is an amenable number.

74399440 is an abundant number, since it is smaller than the sum of its proper divisors (107687120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

74399440 is a wasteful number, since it uses less digits than its factorization.

74399440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48979 (or 48973 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 74399440 is about 8625.5109993553. The cubic root of 74399440 is about 420.5876882491.

The spelling of 74399440 in words is "seventy-four million, three hundred ninety-nine thousand, four hundred forty".