156402540 has 144 divisors (see below), whose sum is σ = 548009280. Its totient is φ = 35366400.

The previous prime is 156402529. The next prime is 156402551. The reversal of 156402540 is 45204651.

156402540 is a `hidden beast` number, since 15 + 640 + 2 + 5 + 4 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (156402529) and next prime (156402551).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 126646 + ... + 127874.

It is an arithmetic number, because the mean of its divisors is an integer number (3805620).

Almost surely, 2^156402540 is an apocalyptic number.

156402540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 156402540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (274004640).

156402540 is an abundant number, since it is smaller than the sum of its proper divisors (391606740).

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

156402540 is a wasteful number, since it uses less digits than its factorization.

156402540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1352 (or 1347 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 156402540 is about 12506.1001115456. The cubic root of 156402540 is about 538.7838888177.

The spelling of 156402540 in words is "one hundred fifty-six million, four hundred two thousand, five hundred forty".