40404138 has 16 divisors (see below), whose sum is σ = 85561920. Its totient is φ = 12675776.

The previous prime is 40404101. The next prime is 40404139. The reversal of 40404138 is 83140404.

It is not an unprimeable number, because it can be changed into a prime (40404139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197958 + ... + 198161.

It is an arithmetic number, because the mean of its divisors is an integer number (5347620).

Almost surely, 2^40404138 is an apocalyptic number.

40404138 is an abundant number, since it is smaller than the sum of its proper divisors (45157782).

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

40404138 is a wasteful number, since it uses less digits than its factorization.

40404138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396141.

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 40404138 is about 6356.4249385956. The cubic root of 40404138 is about 343.1431090870.

The spelling of 40404138 in words is "forty million, four hundred four thousand, one hundred thirty-eight".