5402639 has 4 divisors (see below), whose sum is σ = 5893800. Its totient is φ = 4911480.

The previous prime is 5402633. The next prime is 5402647. The reversal of 5402639 is 9362045.

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

It is a cyclic number.

It is not a de Polignac number, because 5402639 - 2⁴ = 5402623 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5402633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 245564 + ... + 245585.

It is an arithmetic number, because the mean of its divisors is an integer number (1473450).

Almost surely, 2^5402639 is an apocalyptic number.

5402639 is a deficient number, since it is larger than the sum of its proper divisors (491161).

5402639 is a wasteful number, since it uses less digits than its factorization.

5402639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491160.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 5402639 is about 2324.3577607589. The cubic root of 5402639 is about 175.4696392044.

It can be divided in two parts, 5402 and 639, that multiplied together give a triangular number (3451878 = T₂₆₂₇).

The spelling of 5402639 in words is "five million, four hundred two thousand, six hundred thirty-nine".