2639957 has 4 divisors (see below), whose sum is σ = 2731020. Its totient is φ = 2548896.

The previous prime is 2639953. The next prime is 2639969. The reversal of 2639957 is 7599362.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7599362 = 2 ⋅3799681.

It can be written as a sum of positive squares in 2 ways, for example, as 1745041 + 894916 = 1321^2 + 946^2 .

It is a cyclic number.

It is not a de Polignac number, because 2639957 - 2² = 2639953 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2639953) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45488 + ... + 45545.

It is an arithmetic number, because the mean of its divisors is an integer number (682755).

2^2639957 is an apocalyptic number.

It is an amenable number.

2639957 is a deficient number, since it is larger than the sum of its proper divisors (91063).

2639957 is an equidigital number, since it uses as much as digits as its factorization.

2639957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91062.

The product of its digits is 102060, while the sum is 41.

The square root of 2639957 is about 1624.7944485380. The cubic root of 2639957 is about 138.2077142219.

The spelling of 2639957 in words is "two million, six hundred thirty-nine thousand, nine hundred fifty-seven".