79400749 has 4 divisors (see below), whose sum is σ = 79422336. Its totient is φ = 79379164.

The previous prime is 79400707. The next prime is 79400771. The reversal of 79400749 is 94700497.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94700497 = 787 ⋅120331.

It is a cyclic number.

It is not a de Polignac number, because 79400749 - 2⁷ = 79400621 is a prime.

It is a super-2 number, since 2×79400749² = 12608957883522002, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79404749) 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, 3739 + ... + 13144.

It is an arithmetic number, because the mean of its divisors is an integer number (19855584).

Almost surely, 2^79400749 is an apocalyptic number.

It is an amenable number.

79400749 is a deficient number, since it is larger than the sum of its proper divisors (21587).

79400749 is a wasteful number, since it uses less digits than its factorization.

79400749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21586.

The product of its (nonzero) digits is 63504, while the sum is 40.

The square root of 79400749 is about 8910.7097921546. The cubic root of 79400749 is about 429.8083678286.

The spelling of 79400749 in words is "seventy-nine million, four hundred thousand, seven hundred forty-nine".