405388172077 has 32 divisors (see below), whose sum is σ = 512896204800. Its totient is φ = 312395263488.

The previous prime is 405388171943. The next prime is 405388172131. The reversal of 405388172077 is 770271883504.

It is not a de Polignac number, because 405388172077 - 2¹⁹ = 405387647789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405388172177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 133252 + ... + 910237.

It is an arithmetic number, because the mean of its divisors is an integer number (16028006400).

Almost surely, 2^405388172077 is an apocalyptic number.

It is an amenable number.

405388172077 is a deficient number, since it is larger than the sum of its proper divisors (107508032723).

405388172077 is a wasteful number, since it uses less digits than its factorization.

405388172077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1043665.

The product of its (nonzero) digits is 2634240, while the sum is 52.

The spelling of 405388172077 in words is "four hundred five billion, three hundred eighty-eight million, one hundred seventy-two thousand, seventy-seven".