74139497 has 4 divisors (see below), whose sum is σ = 74210436. Its totient is φ = 74068560.

The previous prime is 74139493. The next prime is 74139529. The reversal of 74139497 is 79493147.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79493147 = 29 ⋅2741143.

It can be written as a sum of positive squares in 2 ways, for example, as 19616041 + 54523456 = 4429^2 + 7384^2 .

It is a cyclic number.

It is not a de Polignac number, because 74139497 - 2² = 74139493 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74139493) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33878 + ... + 35999.

It is an arithmetic number, because the mean of its divisors is an integer number (18552609).

Almost surely, 2^74139497 is an apocalyptic number.

It is an amenable number.

74139497 is a deficient number, since it is larger than the sum of its proper divisors (70939).

74139497 is a wasteful number, since it uses less digits than its factorization.

74139497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70938.

The product of its digits is 190512, while the sum is 44.

The square root of 74139497 is about 8610.4295479378. The cubic root of 74139497 is about 420.0972884979.

The spelling of 74139497 in words is "seventy-four million, one hundred thirty-nine thousand, four hundred ninety-seven".