54139905 has 24 divisors (see below), whose sum is σ = 94348800. Its totient is φ = 28718880.

The previous prime is 54139903. The next prime is 54139909. The reversal of 54139905 is 50993145.

It is not a de Polignac number, because 54139905 - 2¹ = 54139903 is a prime.

It is a super-2 number, since 2×54139905² = 5862258626818050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 54139905.

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 23 ways as a sum of consecutive naturals, for example, 5446 + ... + 11744.

It is an arithmetic number, because the mean of its divisors is an integer number (3931200).

Almost surely, 2^54139905 is an apocalyptic number.

It is an amenable number.

54139905 is a deficient number, since it is larger than the sum of its proper divisors (40208895).

54139905 is a wasteful number, since it uses less digits than its factorization.

54139905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6501 (or 6498 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 36.

The square root of 54139905 is about 7357.9824000877. The cubic root of 54139905 is about 378.3024580150.

The spelling of 54139905 in words is "fifty-four million, one hundred thirty-nine thousand, nine hundred five".