40138911 has 12 divisors (see below), whose sum is σ = 58631040. Its totient is φ = 26458080.

The previous prime is 40138867. The next prime is 40138919. The reversal of 40138911 is 11983104.

It is not a de Polignac number, because 40138911 - 2¹³ = 40130719 is a prime.

It is a super-2 number, since 2×40138911² = 3222264352531842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40138919) 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, 24255 + ... + 25856.

It is an arithmetic number, because the mean of its divisors is an integer number (4885920).

Almost surely, 2^40138911 is an apocalyptic number.

40138911 is a deficient number, since it is larger than the sum of its proper divisors (18492129).

40138911 is a wasteful number, since it uses less digits than its factorization.

40138911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50206 (or 50203 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 40138911 is about 6335.5276812591. The cubic root of 40138911 is about 342.3906227188.

The spelling of 40138911 in words is "forty million, one hundred thirty-eight thousand, nine hundred eleven".