39679999 has 4 divisors (see below), whose sum is σ = 41768440. Its totient is φ = 37591560.

The previous prime is 39679993. The next prime is 39680009. The reversal of 39679999 is 99997693.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99997693 = 6427 ⋅15559.

It is a cyclic number.

It is not a de Polignac number, because 39679999 - 2⁵ = 39679967 is a prime.

It is a Duffinian number.

39679999 is a modest number, since divided by 9999 gives 3967 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39679993) 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, 1044192 + ... + 1044229.

It is an arithmetic number, because the mean of its divisors is an integer number (10442110).

Almost surely, 2^39679999 is an apocalyptic number.

39679999 is a deficient number, since it is larger than the sum of its proper divisors (2088441).

39679999 is a wasteful number, since it uses less digits than its factorization.

39679999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2088440.

The product of its digits is 7440174, while the sum is 61.

The square root of 39679999 is about 6299.2062198344. The cubic root of 39679999 is about 341.0807564660.

The spelling of 39679999 in words is "thirty-nine million, six hundred seventy-nine thousand, nine hundred ninety-nine".