4155987 has 18 divisors (see below), whose sum is σ = 6148324. Its totient is φ = 2495240.

The previous prime is 4155929. The next prime is 4155989. The reversal of 4155987 is 7895514.

It is not a de Polignac number, because 4155987 - 2⁶ = 4155923 is a prime.

It is a Duffinian number.

4155987 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (4155989) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 38788 + ... + 38894.

Almost surely, 2^4155987 is an apocalyptic number.

4155987 is a deficient number, since it is larger than the sum of its proper divisors (1992337).

4155987 is a wasteful number, since it uses less digits than its factorization.

4155987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239 (or 121 counting only the distinct ones).

The product of its digits is 50400, while the sum is 39.

The square root of 4155987 is about 2038.6238005086. The cubic root of 4155987 is about 160.7772984090. Note that the first 3 decimals are identical.

The spelling of 4155987 in words is "four million, one hundred fifty-five thousand, nine hundred eighty-seven".