2639698 has 4 divisors (see below), whose sum is σ = 3959550. Its totient is φ = 1319848.

The previous prime is 2639669. The next prime is 2639699. The reversal of 2639698 is 8969362.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2259009 + 380689 = 1503^2 + 617^2 .

It is not an unprimeable number, because it can be changed into a prime (2639699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 659923 + ... + 659926.

2^2639698 is an apocalyptic number.

2639698 is a deficient number, since it is larger than the sum of its proper divisors (1319852).

2639698 is a wasteful number, since it uses less digits than its factorization.

2639698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1319851.

The product of its digits is 139968, while the sum is 43.

The square root of 2639698 is about 1624.7147441936. The cubic root of 2639698 is about 138.2031943290.

The spelling of 2639698 in words is "two million, six hundred thirty-nine thousand, six hundred ninety-eight".