2556387 has 16 divisors (see below), whose sum is σ = 3842080. Its totient is φ = 1679616.

The previous prime is 2556373. The next prime is 2556397. The reversal of 2556387 is 7836552.

It is not a de Polignac number, because 2556387 - 2⁷ = 2556259 is a prime.

It is a super-2 number, since 2×2556387² = 13070228987538, which contains 22 as substring.

It is a Duffinian number.

2556387 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2556397) 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, 1323 + ... + 2619.

It is an arithmetic number, because the mean of its divisors is an integer number (240130).

2^2556387 is an apocalyptic number.

2556387 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

2556387 is a deficient number, since it is larger than the sum of its proper divisors (1285693).

2556387 is a wasteful number, since it uses less digits than its factorization.

2556387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1379 (or 1373 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The square root of 2556387 is about 1598.8705388492. The cubic root of 2556387 is about 136.7336897775.

The spelling of 2556387 in words is "two million, five hundred fifty-six thousand, three hundred eighty-seven".