74986391 has 2 divisors, whose sum is σ = 74986392. Its totient is φ = 74986390.

The previous prime is 74986381. The next prime is 74986399. The reversal of 74986391 is 19368947.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 74986391 - 2²² = 70792087 is a prime.

It is a super-3 number, since 3×74986391³ (a number of 25 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74986399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37493195 + 37493196.

It is an arithmetic number, because the mean of its divisors is an integer number (37493196).

Almost surely, 2^74986391 is an apocalyptic number.

74986391 is a deficient number, since it is larger than the sum of its proper divisors (1).

74986391 is an equidigital number, since it uses as much as digits as its factorization.

74986391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 47.

The square root of 74986391 is about 8659.4682862171. The cubic root of 74986391 is about 421.6908238298.

The spelling of 74986391 in words is "seventy-four million, nine hundred eighty-six thousand, three hundred ninety-one".