39979199 has 4 divisors (see below), whose sum is σ = 43054536. Its totient is φ = 36903864.

The previous prime is 39979183. The next prime is 39979201. The reversal of 39979199 is 99197993.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 39979199 - 2⁴ = 39979183 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 (39979999) 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, 1537649 + ... + 1537674.

It is an arithmetic number, because the mean of its divisors is an integer number (10763634).

Almost surely, 2^39979199 is an apocalyptic number.

39979199 is a deficient number, since it is larger than the sum of its proper divisors (3075337).

39979199 is a wasteful number, since it uses less digits than its factorization.

39979199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3075336.

The product of its digits is 1240029, while the sum is 56.

The square root of 39979199 is about 6322.9106430504. The cubic root of 39979199 is about 341.9358970402.

The spelling of 39979199 in words is "thirty-nine million, nine hundred seventy-nine thousand, one hundred ninety-nine".