2457639 has 12 divisors (see below), whose sum is σ = 3758976. Its totient is φ = 1541952.

The previous prime is 2457617. The next prime is 2457641. The reversal of 2457639 is 9367542.

It is not a de Polignac number, because 2457639 - 2⁵ = 2457607 is a prime.

2457639 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2457139) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7879 + ... + 8184.

It is an arithmetic number, because the mean of its divisors is an integer number (313248).

2^2457639 is an apocalyptic number.

2457639 is a deficient number, since it is larger than the sum of its proper divisors (1301337).

2457639 is a wasteful number, since it uses less digits than its factorization.

2457639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16086 (or 16083 counting only the distinct ones).

The product of its digits is 45360, while the sum is 36.

The square root of 2457639 is about 1567.6858741470. The cubic root of 2457639 is about 134.9499402873.

Subtracting 2457639 from its reverse (9367542), we obtain a triangular number (6909903 = T₃₇₁₇).

The spelling of 2457639 in words is "two million, four hundred fifty-seven thousand, six hundred thirty-nine".