74139840 has 112 divisors (see below), whose sum is σ = 261579360. Its totient is φ = 19768320.

The previous prime is 74139811. The next prime is 74139847. The reversal of 74139840 is 4893147.

It is a happy number.

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 = 74139795 and 74139804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74139847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4350 + ... + 12930.

It is an arithmetic number, because the mean of its divisors is an integer number (2335530).

Almost surely, 2^74139840 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 74139840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (130789680).

74139840 is an abundant number, since it is smaller than the sum of its proper divisors (187439520).

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

74139840 is a wasteful number, since it uses less digits than its factorization.

74139840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8607 (or 8591 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 74139840 is about 8610.4494656202. The cubic root of 74139840 is about 420.0979363449.

The spelling of 74139840 in words is "seventy-four million, one hundred thirty-nine thousand, eight hundred forty".