39938977 has 4 divisors (see below), whose sum is σ = 43011220. Its totient is φ = 36866736.

The previous prime is 39938963. The next prime is 39938981. The reversal of 39938977 is 77983993.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6345361 + 33593616 = 2519^2 + 5796^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39938977 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 7.

It is a zygodrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (39938077) 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, 1536102 + ... + 1536127.

It is an arithmetic number, because the mean of its divisors is an integer number (10752805).

Almost surely, 2^39938977 is an apocalyptic number.

It is an amenable number.

39938977 is a deficient number, since it is larger than the sum of its proper divisors (3072243).

39938977 is a wasteful number, since it uses less digits than its factorization.

39938977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3072242.

The product of its digits is 2571912, while the sum is 55.

The square root of 39938977 is about 6319.7291872358. The cubic root of 39938977 is about 341.8211877175.

The spelling of 39938977 in words is "thirty-nine million, nine hundred thirty-eight thousand, nine hundred seventy-seven".