74139815 has 8 divisors (see below), whose sum is σ = 89224800. Its totient is φ = 59140512.

The previous prime is 74139811. The next prime is 74139847. The reversal of 74139815 is 51893147.

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

It is a cyclic number.

It is not a de Polignac number, because 74139815 - 2² = 74139811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74139811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19499 + ... + 22988.

It is an arithmetic number, because the mean of its divisors is an integer number (11153100).

Almost surely, 2^74139815 is an apocalyptic number.

74139815 is a deficient number, since it is larger than the sum of its proper divisors (15084985).

74139815 is a wasteful number, since it uses less digits than its factorization.

74139815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42841.

The product of its digits is 30240, while the sum is 38.

The square root of 74139815 is about 8610.4480138957. The cubic root of 74139815 is about 420.0978891258.

The spelling of 74139815 in words is "seventy-four million, one hundred thirty-nine thousand, eight hundred fifteen".