405140138 has 32 divisors (see below), whose sum is σ = 671932800. Its totient is φ = 182056896.

The previous prime is 405140123. The next prime is 405140149. The reversal of 405140138 is 831041504.

It is a Harshad number since it is a multiple of its sum of digits (26).

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, 165995 + ... + 168417.

It is an arithmetic number, because the mean of its divisors is an integer number (20997900).

Almost surely, 2^405140138 is an apocalyptic number.

405140138 is a deficient number, since it is larger than the sum of its proper divisors (266792662).

405140138 is a wasteful number, since it uses less digits than its factorization.

405140138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2606.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 405140138 is about 20128.0932529636. The cubic root of 405140138 is about 739.9489482677.

The spelling of 405140138 in words is "four hundred five million, one hundred forty thousand, one hundred thirty-eight".