39901945 has 8 divisors (see below), whose sum is σ = 48248640. Its totient is φ = 31677360.

The previous prime is 39901937. The next prime is 39901963. The reversal of 39901945 is 54910993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 39901945 - 2³ = 39901937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 39901898 and 39901907.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29805 + ... + 31114.

It is an arithmetic number, because the mean of its divisors is an integer number (6031080).

Almost surely, 2^39901945 is an apocalyptic number.

It is an amenable number.

39901945 is a deficient number, since it is larger than the sum of its proper divisors (8346695).

39901945 is a wasteful number, since it uses less digits than its factorization.

39901945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61055.

The product of its (nonzero) digits is 43740, while the sum is 40.

The square root of 39901945 is about 6316.7986353849. The cubic root of 39901945 is about 341.7155078569.

The spelling of 39901945 in words is "thirty-nine million, nine hundred one thousand, nine hundred forty-five".