74387839 has 4 divisors (see below), whose sum is σ = 74740600. Its totient is φ = 74035080.

The previous prime is 74387809. The next prime is 74387843. The reversal of 74387839 is 93878347.

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

It is a cyclic number.

It is not a de Polignac number, because 74387839 - 2⁷ = 74387711 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 74387792 and 74387801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74387809) 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, 176064 + ... + 176485.

It is an arithmetic number, because the mean of its divisors is an integer number (18685150).

Almost surely, 2^74387839 is an apocalyptic number.

74387839 is a deficient number, since it is larger than the sum of its proper divisors (352761).

74387839 is a wasteful number, since it uses less digits than its factorization.

74387839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352760.

The product of its digits is 1016064, while the sum is 49.

The square root of 74387839 is about 8624.8384912414. The cubic root of 74387839 is about 420.5658265639.

The spelling of 74387839 in words is "seventy-four million, three hundred eighty-seven thousand, eight hundred thirty-nine".