156840390 has 96 divisors (see below), whose sum is σ = 468426816. Its totient is φ = 35665920.

The previous prime is 156840379. The next prime is 156840391. The reversal of 156840390 is 93048651.

156840390 is a `hidden beast` number, since 1 + 568 + 4 + 0 + 3 + 90 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156840391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 151314 + ... + 152346.

It is an arithmetic number, because the mean of its divisors is an integer number (4879446).

Almost surely, 2^156840390 is an apocalyptic number.

156840390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 156840390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (234213408).

156840390 is an abundant number, since it is smaller than the sum of its proper divisors (311586426).

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

156840390 is a wasteful number, since it uses less digits than its factorization.

156840390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1294 (or 1291 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 156840390 is about 12523.5933341833. The cubic root of 156840390 is about 539.2861967871.

The spelling of 156840390 in words is "one hundred fifty-six million, eight hundred forty thousand, three hundred ninety".