2639497 has 4 divisors (see below), whose sum is σ = 3016576. Its totient is φ = 2262420.

The previous prime is 2639491. The next prime is 2639501. The reversal of 2639497 is 7949362.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7949362 = 2 ⋅3974681.

It is a cyclic number.

It is not a de Polignac number, because 2639497 - 2³ = 2639489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2639491) 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, 188529 + ... + 188542.

It is an arithmetic number, because the mean of its divisors is an integer number (754144).

2^2639497 is an apocalyptic number.

It is an amenable number.

2639497 is a deficient number, since it is larger than the sum of its proper divisors (377079).

2639497 is an equidigital number, since it uses as much as digits as its factorization.

2639497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377078.

The product of its digits is 81648, while the sum is 40.

The square root of 2639497 is about 1624.6528860037. The cubic root of 2639497 is about 138.1996864091.

It can be divided in two parts, 2639 and 497, that added together give a square (3136 = 56²).

The spelling of 2639497 in words is "two million, six hundred thirty-nine thousand, four hundred ninety-seven".