74409840 has 100 divisors (see below), whose sum is σ = 258458904. Its totient is φ = 19840896.

The previous prime is 74409787. The next prime is 74409847. The reversal of 74409840 is 4890447.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 74409795 and 74409804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74409847) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 739 + ... + 12221.

Almost surely, 2^74409840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 74409840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129229452).

74409840 is an abundant number, since it is smaller than the sum of its proper divisors (184049064).

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

74409840 is a wasteful number, since it uses less digits than its factorization.

74409840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11508 (or 11493 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 74409840 is about 8626.1138411222. The cubic root of 74409840 is about 420.6072847593.

The spelling of 74409840 in words is "seventy-four million, four hundred nine thousand, eight hundred forty".