74139477 has 8 divisors (see below), whose sum is σ = 99005280. Its totient is φ = 49350000.

The previous prime is 74139469. The next prime is 74139479. The reversal of 74139477 is 77493147.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 74139477 - 2³ = 74139469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74139479) 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, 16774 + ... + 20727.

It is an arithmetic number, because the mean of its divisors is an integer number (12375660).

Almost surely, 2^74139477 is an apocalyptic number.

It is an amenable number.

74139477 is a deficient number, since it is larger than the sum of its proper divisors (24865803).

74139477 is a wasteful number, since it uses less digits than its factorization.

74139477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38163.

The product of its digits is 148176, while the sum is 42.

The square root of 74139477 is about 8610.4283865555. The cubic root of 74139477 is about 420.0972507226.

The spelling of 74139477 in words is "seventy-four million, one hundred thirty-nine thousand, four hundred seventy-seven".