39145240 has 32 divisors (see below), whose sum is σ = 88673760. Its totient is φ = 15552000.

The previous prime is 39145181. The next prime is 39145243. The reversal of 39145240 is 4254193.

It is a junction number, because it is equal to n+sod(n) for n = 39145199 and 39145208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39145243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2800 + ... + 9280.

It is an arithmetic number, because the mean of its divisors is an integer number (2771055).

Almost surely, 2^39145240 is an apocalyptic number.

It is an amenable number.

39145240 is an abundant number, since it is smaller than the sum of its proper divisors (49528520).

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

39145240 is a wasteful number, since it uses less digits than its factorization.

39145240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6643 (or 6639 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 39145240 is about 6256.6156986026. The cubic root of 39145240 is about 339.5415967709.

The spelling of 39145240 in words is "thirty-nine million, one hundred forty-five thousand, two hundred forty".