2658639 has 16 divisors (see below), whose sum is σ = 3773952. Its totient is φ = 1661088.

The previous prime is 2658637. The next prime is 2658641. The reversal of 2658639 is 9368562.

It is an interprime number because it is at equal distance from previous prime (2658637) and next prime (2658641).

It is not a de Polignac number, because 2658639 - 2¹ = 2658637 is a prime.

It is a super-2 number, since 2×2658639² = 14136722664642, which contains 22 as substring.

It is a d-powerful number, because it can be written as 2²⁰ + 6 + 5⁶ + 8² + 6² + 3¹³ + 9 .

It is a junction number, because it is equal to n+sod(n) for n = 2658597 and 2658606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2658637) 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, 3294 + ... + 4020.

It is an arithmetic number, because the mean of its divisors is an integer number (235872).

2^2658639 is an apocalyptic number.

2658639 is a deficient number, since it is larger than the sum of its proper divisors (1115313).

2658639 is a wasteful number, since it uses less digits than its factorization.

2658639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806.

The product of its digits is 77760, while the sum is 39.

The square root of 2658639 is about 1630.5333483250. The cubic root of 2658639 is about 138.5329631733.

The spelling of 2658639 in words is "two million, six hundred fifty-eight thousand, six hundred thirty-nine".