405128139 has 32 divisors (see below), whose sum is σ = 619799040. Its totient is φ = 233175552.

The previous prime is 405128123. The next prime is 405128147. The reversal of 405128139 is 931821504.

It is not a de Polignac number, because 405128139 - 2⁴ = 405128123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (405128159) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 108892 + ... + 112550.

It is an arithmetic number, because the mean of its divisors is an integer number (19368720).

Almost surely, 2^405128139 is an apocalyptic number.

405128139 is a deficient number, since it is larger than the sum of its proper divisors (214670901).

405128139 is a wasteful number, since it uses less digits than its factorization.

405128139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3859.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 405128139 is about 20127.7951847687. The cubic root of 405128139 is about 739.9416431945.

The spelling of 405128139 in words is "four hundred five million, one hundred twenty-eight thousand, one hundred thirty-nine".