840135952 has 20 divisors (see below), whose sum is σ = 1628398876. Its totient is φ = 419904000.

The previous prime is 840135917. The next prime is 840135979. The reversal of 840135952 is 259531048.

It can be written as a sum of positive squares in 2 ways, for example, as 151388416 + 688747536 = 12304^2 + 26244^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39268 + ... + 56764.

Almost surely, 2^840135952 is an apocalyptic number.

It is an amenable number.

840135952 is a deficient number, since it is larger than the sum of its proper divisors (788262924).

840135952 is a wasteful number, since it uses less digits than its factorization.

840135952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20506 (or 20500 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 840135952 is about 28985.0987923105. The cubic root of 840135952 is about 943.5896964866.

The spelling of 840135952 in words is "eight hundred forty million, one hundred thirty-five thousand, nine hundred fifty-two".