2155914440 has 32 divisors (see below), whose sum is σ = 4954020480. Its totient is φ = 844016832.

The previous prime is 2155914427. The next prime is 2155914451. The reversal of 2155914440 is 444195512.

It is a self number, because there is not a number n which added to its sum of digits gives 2155914440.

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, 571502 + ... + 575261.

It is an arithmetic number, because the mean of its divisors is an integer number (154813140).

Almost surely, 2^2155914440 is an apocalyptic number.

2155914440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2155914440 is an abundant number, since it is smaller than the sum of its proper divisors (2798106040).

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

2155914440 is a wasteful number, since it uses less digits than its factorization.

2155914440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1146821 (or 1146817 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 2155914440 is about 46431.8257233118. The cubic root of 2155914440 is about 1291.8452929424.

The spelling of 2155914440 in words is "two billion, one hundred fifty-five million, nine hundred fourteen thousand, four hundred forty".