79402402 has 4 divisors (see below), whose sum is σ = 119103606. Its totient is φ = 39701200.

The previous prime is 79402373. The next prime is 79402409. The reversal of 79402402 is 20420497.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20420497 = 19 ⋅1074763.

It can be written as a sum of positive squares in only one way, i.e., 71723961 + 7678441 = 8469^2 + 2771^2 .

It is not an unprimeable number, because it can be changed into a prime (79402409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19850599 + ... + 19850602.

Almost surely, 2^79402402 is an apocalyptic number.

79402402 is a deficient number, since it is larger than the sum of its proper divisors (39701204).

79402402 is a wasteful number, since it uses less digits than its factorization.

79402402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39701203.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 79402402 is about 8910.8025452257. The cubic root of 79402402 is about 429.8113504549.

Adding to 79402402 its reverse (20420497), we get a palindrome (99822899).

The spelling of 79402402 in words is "seventy-nine million, four hundred two thousand, four hundred two".