40139904 has 128 divisors (see below), whose sum is σ = 123868800. Its totient is φ = 11280384.

The previous prime is 40139893. The next prime is 40139917. The reversal of 40139904 is 40993104.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×40139904² = 3222423786258432, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 292924 + ... + 293060.

It is an arithmetic number, because the mean of its divisors is an integer number (967725).

Almost surely, 2^40139904 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 40139904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61934400).

40139904 is an abundant number, since it is smaller than the sum of its proper divisors (83728896).

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

40139904 is a wasteful number, since it uses less digits than its factorization.

40139904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270 (or 258 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 40139904 is about 6335.6060483588. The cubic root of 40139904 is about 342.3934461726.

The spelling of 40139904 in words is "forty million, one hundred thirty-nine thousand, nine hundred four".