2187887956 has 12 divisors (see below), whose sum is σ = 3833246592. Its totient is φ = 1092674648.

The previous prime is 2187887953. The next prime is 2187887983. The reversal of 2187887956 is 6597887812.

It is a junction number, because it is equal to n+sod(n) for n = 2187887894 and 2187887903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2187887953) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 313450 + ... + 320353.

It is an arithmetic number, because the mean of its divisors is an integer number (319437216).

Almost surely, 2^2187887956 is an apocalyptic number.

It is an amenable number.

2187887956 is a deficient number, since it is larger than the sum of its proper divisors (1645358636).

2187887956 is a wasteful number, since it uses less digits than its factorization.

2187887956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634670 (or 634668 counting only the distinct ones).

The product of its digits is 13547520, while the sum is 61.

The square root of 2187887956 is about 46774.8645748975. The cubic root of 2187887956 is about 1298.2002622309.

The spelling of 2187887956 in words is "two billion, one hundred eighty-seven million, eight hundred eighty-seven thousand, nine hundred fifty-six".