2156158440 has 96 divisors (see below), whose sum is σ = 7267085280. Its totient is φ = 574972992.

The previous prime is 2156158379. The next prime is 2156158453. The reversal of 2156158440 is 448516512.

It is a happy number.

2156158440 is a `hidden beast` number, since 2 + 1 + 561 + 58 + 4 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 2156158395 and 2156158404.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 101194 + ... + 120633.

It is an arithmetic number, because the mean of its divisors is an integer number (75698805).

Almost surely, 2^2156158440 is an apocalyptic number.

2156158440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2156158440 is an abundant number, since it is smaller than the sum of its proper divisors (5110926840).

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

2156158440 is a wasteful number, since it uses less digits than its factorization.

2156158440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221853 (or 221837 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The square root of 2156158440 is about 46434.4531571117. The cubic root of 2156158440 is about 1291.8940268431.

The spelling of 2156158440 in words is "two billion, one hundred fifty-six million, one hundred fifty-eight thousand, four hundred forty".