2154815400 has 48 divisors (see below), whose sum is σ = 6679929600. Its totient is φ = 574617280.

The previous prime is 2154815381. The next prime is 2154815413. The reversal of 2154815400 is 45184512.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1795080 + ... + 1796279.

It is an arithmetic number, because the mean of its divisors is an integer number (139165200).

Almost surely, 2^2154815400 is an apocalyptic number.

2154815400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2154815400 is an abundant number, since it is smaller than the sum of its proper divisors (4525114200).

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

2154815400 is a wasteful number, since it uses less digits than its factorization.

2154815400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3591378 (or 3591369 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 30.

The square root of 2154815400 is about 46419.9892287794. The cubic root of 2154815400 is about 1291.6257370774.

Adding to 2154815400 its reverse (45184512), we get a palindrome (2199999912).

The spelling of 2154815400 in words is "two billion, one hundred fifty-four million, eight hundred fifteen thousand, four hundred".