2656387 has 2 divisors, whose sum is σ = 2656388. Its totient is φ = 2656386.

The previous prime is 2656373. The next prime is 2656391. The reversal of 2656387 is 7836562.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2656387 is a prime.

2656387 is a lucky number.

It is equal to p₁₉₃₆₉₉ and since 2656387 and 193699 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (2656337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1328193 + 1328194.

It is an arithmetic number, because the mean of its divisors is an integer number (1328194).

2^2656387 is an apocalyptic number.

2656387 is a deficient number, since it is larger than the sum of its proper divisors (1).

2656387 is an equidigital number, since it uses as much as digits as its factorization.

2656387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 37.

The square root of 2656387 is about 1629.8426304401. The cubic root of 2656387 is about 138.4938373448.

The spelling of 2656387 in words is "two million, six hundred fifty-six thousand, three hundred eighty-seven".