74121240 has 32 divisors (see below), whose sum is σ = 222364080. Its totient is φ = 19765632.

The previous prime is 74121211. The next prime is 74121251. The reversal of 74121240 is 4212147.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 308719 + ... + 308958.

Almost surely, 2^74121240 is an apocalyptic number.

It is an amenable number.

74121240 is an abundant number, since it is smaller than the sum of its proper divisors (148242840).

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

74121240 is a wasteful number, since it uses less digits than its factorization.

74121240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617691 (or 617687 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 74121240 is about 8609.3693148802. The cubic root of 74121240 is about 420.0628024001.

Adding to 74121240 its reverse (4212147), we get a palindrome (78333387).

The spelling of 74121240 in words is "seventy-four million, one hundred twenty-one thousand, two hundred forty".