74897839 has 4 divisors (see below), whose sum is σ = 74962440. Its totient is φ = 74833240.

The previous prime is 74897833. The next prime is 74897881. The reversal of 74897839 is 93879847.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74897839 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 74897839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74897833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30529 + ... + 32890.

It is an arithmetic number, because the mean of its divisors is an integer number (18740610).

Almost surely, 2^74897839 is an apocalyptic number.

74897839 is a deficient number, since it is larger than the sum of its proper divisors (64601).

74897839 is a wasteful number, since it uses less digits than its factorization.

74897839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64600.

The product of its digits is 3048192, while the sum is 55.

The square root of 74897839 is about 8654.3537598136. The cubic root of 74897839 is about 421.5247658116.

The spelling of 74897839 in words is "seventy-four million, eight hundred ninety-seven thousand, eight hundred thirty-nine".