39980857 has 4 divisors (see below), whose sum is σ = 45692416. Its totient is φ = 34269300.

The previous prime is 39980839. The next prime is 39980887. The reversal of 39980857 is 75808993.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39980857 is a prime.

It is a super-4 number, since 4×39980857⁴ (a number of 32 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 39980857.

It is not an unprimeable number, because it can be changed into a prime (39980827) 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, 2855769 + ... + 2855782.

It is an arithmetic number, because the mean of its divisors is an integer number (11423104).

Almost surely, 2^39980857 is an apocalyptic number.

It is an amenable number.

39980857 is a deficient number, since it is larger than the sum of its proper divisors (5711559).

39980857 is an equidigital number, since it uses as much as digits as its factorization.

39980857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5711558.

The product of its (nonzero) digits is 544320, while the sum is 49.

The square root of 39980857 is about 6323.0417521949. The cubic root of 39980857 is about 341.9406238473.

The spelling of 39980857 in words is "thirty-nine million, nine hundred eighty thousand, eight hundred fifty-seven".