39145840 has 40 divisors (see below), whose sum is σ = 91275408. Its totient is φ = 15613440.

The previous prime is 39145837. The next prime is 39145861. The reversal of 39145840 is 4854193.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 39145796 and 39145805.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51060 + ... + 51820.

Almost surely, 2^39145840 is an apocalyptic number.

It is an amenable number.

39145840 is an abundant number, since it is smaller than the sum of its proper divisors (52129568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

39145840 is a wasteful number, since it uses less digits than its factorization.

39145840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1417 (or 1411 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 39145840 is about 6256.6636476640. The cubic root of 39145840 is about 339.5433315405.

The spelling of 39145840 in words is "thirty-nine million, one hundred forty-five thousand, eight hundred forty".