54139904 has 132 divisors (see below), whose sum is σ = 137214504. Its totient is φ = 21159936.

The previous prime is 54139903. The next prime is 54139909. The reversal of 54139904 is 40993145.

It is a super-2 number, since 2×54139904² = 5862258410258432, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54139903) 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, 652247 + ... + 652329.

Almost surely, 2^54139904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 54139904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68607252).

54139904 is an abundant number, since it is smaller than the sum of its proper divisors (83074600).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

54139904 is a wasteful number, since it uses less digits than its factorization.

54139904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130 (or 105 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 54139904 is about 7357.9823321343. The cubic root of 54139904 is about 378.3024556858.

The spelling of 54139904 in words is "fifty-four million, one hundred thirty-nine thousand, nine hundred four".