2155401400 has 24 divisors (see below), whose sum is σ = 5011308720. Its totient is φ = 862160480.

The previous prime is 2155401379. The next prime is 2155401433. The reversal of 2155401400 is 41045512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5388304 + ... + 5388703.

It is an arithmetic number, because the mean of its divisors is an integer number (208804530).

Almost surely, 2^2155401400 is an apocalyptic number.

2155401400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2155401400 is an abundant number, since it is smaller than the sum of its proper divisors (2855907320).

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

2155401400 is a wasteful number, since it uses less digits than its factorization.

2155401400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10777023 (or 10777014 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 2155401400 is about 46426.3007356821. The cubic root of 2155401400 is about 1291.7428119291.

Adding to 2155401400 its reverse (41045512), we get a palindrome (2196446912).

The spelling of 2155401400 in words is "two billion, one hundred fifty-five million, four hundred one thousand, four hundred".