39945658 has 4 divisors (see below), whose sum is σ = 59918490. Its totient is φ = 19972828.

The previous prime is 39945649. The next prime is 39945677. The reversal of 39945658 is 85654993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85654993 = 17 ⋅5038529.

It can be written as a sum of positive squares in only one way, i.e., 35796289 + 4149369 = 5983^2 + 2037^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9986413 + ... + 9986416.

Almost surely, 2^39945658 is an apocalyptic number.

39945658 is a deficient number, since it is larger than the sum of its proper divisors (19972832).

39945658 is a wasteful number, since it uses less digits than its factorization.

39945658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19972831.

The product of its digits is 1166400, while the sum is 49.

The square root of 39945658 is about 6320.2577479087. The cubic root of 39945658 is about 341.8402466268.

The spelling of 39945658 in words is "thirty-nine million, nine hundred forty-five thousand, six hundred fifty-eight".