39678949 has 4 divisors (see below), whose sum is σ = 39701664. Its totient is φ = 39656236.

The previous prime is 39678937. The next prime is 39678953. The reversal of 39678949 is 94987693.

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: 94987693 = 41 ⋅2316773.

It is a cyclic number.

It is not a de Polignac number, because 39678949 - 2²³ = 31290341 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 39678949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39678049) 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, 8497 + ... + 12310.

It is an arithmetic number, because the mean of its divisors is an integer number (9925416).

Almost surely, 2^39678949 is an apocalyptic number.

It is an amenable number.

39678949 is a deficient number, since it is larger than the sum of its proper divisors (22715).

39678949 is a wasteful number, since it uses less digits than its factorization.

39678949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22714.

The product of its digits is 2939328, while the sum is 55.

The square root of 39678949 is about 6299.1228754486. The cubic root of 39678949 is about 341.0777479146.

The spelling of 39678949 in words is "thirty-nine million, six hundred seventy-eight thousand, nine hundred forty-nine".