2158987 has 16 divisors (see below), whose sum is σ = 2407680. Its totient is φ = 1929312.

The previous prime is 2158979. The next prime is 2158993. The reversal of 2158987 is 7898512.

It is a cyclic number.

It is not a de Polignac number, because 2158987 - 2³ = 2158979 is a prime.

It is a super-2 number, since 2×2158987² = 9322449732338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2158087) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36564 + ... + 36622.

It is an arithmetic number, because the mean of its divisors is an integer number (150480).

2^2158987 is an apocalyptic number.

2158987 is a deficient number, since it is larger than the sum of its proper divisors (248693).

2158987 is a wasteful number, since it uses less digits than its factorization.

2158987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162.

The product of its digits is 40320, while the sum is 40.

The square root of 2158987 is about 1469.3491756557. The cubic root of 2158987 is about 129.2458704426.

The spelling of 2158987 in words is "two million, one hundred fifty-eight thousand, nine hundred eighty-seven".