2187987400 has 48 divisors (see below), whose sum is σ = 5097302100. Its totient is φ = 873434880.

The previous prime is 2187987383. The next prime is 2187987437. The reversal of 2187987400 is 47897812.

It can be written as a sum of positive squares in 6 ways, for example, as 637360516 + 1550626884 = 25246^2 + 39378^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 91054 + ... + 112546.

Almost surely, 2^2187987400 is an apocalyptic number.

2187987400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2187987400 is an abundant number, since it is smaller than the sum of its proper divisors (2909314700).

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

2187987400 is a wasteful number, since it uses less digits than its factorization.

2187987400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22018 (or 22009 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 46.

The square root of 2187987400 is about 46775.9275696378. The cubic root of 2187987400 is about 1298.2199305555.

The spelling of 2187987400 in words is "two billion, one hundred eighty-seven million, nine hundred eighty-seven thousand, four hundred".