39955657 has 16 divisors (see below), whose sum is σ = 46538752. Its totient is φ = 33598800.

The previous prime is 39955633. The next prime is 39955681. The reversal of 39955657 is 75655993.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (39955633) and next prime (39955681).

It is a cyclic number.

It is not a de Polignac number, because 39955657 - 2⁷ = 39955529 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 39955657.

It is not an unprimeable number, because it can be changed into a prime (39955757) 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, 108688 + ... + 109054.

It is an arithmetic number, because the mean of its divisors is an integer number (2908672).

Almost surely, 2^39955657 is an apocalyptic number.

It is an amenable number.

39955657 is a deficient number, since it is larger than the sum of its proper divisors (6583095).

39955657 is a wasteful number, since it uses less digits than its factorization.

39955657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628.

The product of its digits is 1275750, while the sum is 49.

The square root of 39955657 is about 6321.0487262795. The cubic root of 39955657 is about 341.8687668352.

The spelling of 39955657 in words is "thirty-nine million, nine hundred fifty-five thousand, six hundred fifty-seven".