74800391 has 4 divisors (see below), whose sum is σ = 79200432. Its totient is φ = 70400352.

The previous prime is 74800387. The next prime is 74800403. The reversal of 74800391 is 19300847.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19300847 = 59 ⋅327133.

It is a cyclic number.

It is not a de Polignac number, because 74800391 - 2² = 74800387 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 (74800381) 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, 2199995 + ... + 2200028.

It is an arithmetic number, because the mean of its divisors is an integer number (19800108).

Almost surely, 2^74800391 is an apocalyptic number.

74800391 is a deficient number, since it is larger than the sum of its proper divisors (4400041).

74800391 is a wasteful number, since it uses less digits than its factorization.

74800391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4400040.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 74800391 is about 8648.7219287014. The cubic root of 74800391 is about 421.3418741398.

The spelling of 74800391 in words is "seventy-four million, eight hundred thousand, three hundred ninety-one".