2540439 has 24 divisors (see below), whose sum is σ = 4073472. Its totient is φ = 1512720.

The previous prime is 2540431. The next prime is 2540441. The reversal of 2540439 is 9340452.

It is not a de Polignac number, because 2540439 - 2³ = 2540431 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2540431) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6442 + ... + 6824.

It is an arithmetic number, because the mean of its divisors is an integer number (169728).

2^2540439 is an apocalyptic number.

2540439 is a deficient number, since it is larger than the sum of its proper divisors (1533033).

2540439 is a wasteful number, since it uses less digits than its factorization.

2540439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467 (or 464 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 2540439 is about 1593.8754656497. The cubic root of 2540439 is about 136.4487590949.

The spelling of 2540439 in words is "two million, five hundred forty thousand, four hundred thirty-nine".