2156461040 has 40 divisors (see below), whose sum is σ = 5017208640. Its totient is φ = 861993216.

The previous prime is 2156461039. The next prime is 2156461093. The reversal of 2156461040 is 401646512.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 2156460994 and 2156461012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119321 + ... + 136199.

It is an arithmetic number, because the mean of its divisors is an integer number (125430216).

Almost surely, 2^2156461040 is an apocalyptic number.

2156461040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2156461040 is an abundant number, since it is smaller than the sum of its proper divisors (2860747600).

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

2156461040 is a wasteful number, since it uses less digits than its factorization.

2156461040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18489 (or 18483 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 2156461040 is about 46437.7113992496. The cubic root of 2156461040 is about 1291.9544597622.

The spelling of 2156461040 in words is "two billion, one hundred fifty-six million, four hundred sixty-one thousand, forty".