2639439 has 16 divisors (see below), whose sum is σ = 4266240. Its totient is φ = 1599480.

The previous prime is 2639431. The next prime is 2639447. The reversal of 2639439 is 9349362.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2639431) and next prime (2639447).

It is not a de Polignac number, because 2639439 - 2³ = 2639431 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2639431) 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, 4147 + ... + 4740.

It is an arithmetic number, because the mean of its divisors is an integer number (266640).

2^2639439 is an apocalyptic number.

2639439 is a deficient number, since it is larger than the sum of its proper divisors (1626801).

2639439 is a wasteful number, since it uses less digits than its factorization.

2639439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8907 (or 8901 counting only the distinct ones).

The product of its digits is 34992, while the sum is 36.

The square root of 2639439 is about 1624.6350359388. The cubic root of 2639439 is about 138.1986741405.

The spelling of 2639439 in words is "two million, six hundred thirty-nine thousand, four hundred thirty-nine".