74216399 has 4 divisors (see below), whose sum is σ = 75233136. Its totient is φ = 73199664.

The previous prime is 74216393. The next prime is 74216411. The reversal of 74216399 is 99361247.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99361247 = 3779 ⋅26293.

It is a cyclic number.

It is not a de Polignac number, because 74216399 - 2²⁴ = 57439183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74216393) 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, 508259 + ... + 508404.

It is an arithmetic number, because the mean of its divisors is an integer number (18808284).

Almost surely, 2^74216399 is an apocalyptic number.

74216399 is a deficient number, since it is larger than the sum of its proper divisors (1016737).

74216399 is a wasteful number, since it uses less digits than its factorization.

74216399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1016736.

The product of its digits is 81648, while the sum is 41.

The square root of 74216399 is about 8614.8940214027. The cubic root of 74216399 is about 420.2424884673.

The spelling of 74216399 in words is "seventy-four million, two hundred sixteen thousand, three hundred ninety-nine".