54399639 has 16 divisors (see below), whose sum is σ = 83041280. Its totient is φ = 31030560.

The previous prime is 54399599. The next prime is 54399659. The reversal of 54399639 is 93699345.

It is a happy number.

It is not a de Polignac number, because 54399639 - 2¹⁹ = 53875351 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54399659) 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, 11922 + ... + 15840.

It is an arithmetic number, because the mean of its divisors is an integer number (5190080).

Almost surely, 2^54399639 is an apocalyptic number.

54399639 is a deficient number, since it is larger than the sum of its proper divisors (28641641).

54399639 is a wasteful number, since it uses less digits than its factorization.

54399639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4590.

The product of its digits is 787320, while the sum is 48.

The square root of 54399639 is about 7375.6110933264. The cubic root of 54399639 is about 378.9064567259.

The spelling of 54399639 in words is "fifty-four million, three hundred ninety-nine thousand, six hundred thirty-nine".