39999997 has 16 divisors (see below), whose sum is σ = 45800640. Its totient is φ = 34691328.

The previous prime is 39999983. The next prime is 40000003. The reversal of 39999997 is 79999993.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39999997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39999907) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10278 + ... + 13624.

It is an arithmetic number, because the mean of its divisors is an integer number (2862540).

Almost surely, 2^39999997 is an apocalyptic number.

39999997 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

It is an amenable number.

39999997 is a deficient number, since it is larger than the sum of its proper divisors (5800643).

39999997 is a wasteful number, since it uses less digits than its factorization.

39999997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3420.

The product of its digits is 11160261, while the sum is 64.

The square root of 39999997 is about 6324.5550831659. Note that the first 3 decimals coincide. The cubic root of 39999997 is about 341.9951807855.

It can be divided in two parts, 3 and 9999997, that added together give a 7-th power (10000000 = 10⁷).

The spelling of 39999997 in words is "thirty-nine million, nine hundred ninety-nine thousand, nine hundred ninety-seven".