78942249 has 8 divisors (see below), whose sum is σ = 116951520. Its totient is φ = 52628148.

The previous prime is 78942239. The next prime is 78942257. The reversal of 78942249 is 94224987.

It is not a de Polignac number, because 78942249 - 2⁵ = 78942217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78942229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1461867 + ... + 1461920.

It is an arithmetic number, because the mean of its divisors is an integer number (14618940).

Almost surely, 2^78942249 is an apocalyptic number.

It is an amenable number.

78942249 is a deficient number, since it is larger than the sum of its proper divisors (38009271).

78942249 is a wasteful number, since it uses less digits than its factorization.

78942249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2923796 (or 2923790 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 78942249 is about 8884.9450758010. The cubic root of 78942249 is about 428.9794601149.

The spelling of 78942249 in words is "seventy-eight million, nine hundred forty-two thousand, two hundred forty-nine".