100405405 has 16 divisors (see below), whose sum is σ = 127454400. Its totient is φ = 75720960.

The previous prime is 100405397. The next prime is 100405411. The reversal of 100405405 is 504504001.

It is not a de Polignac number, because 100405405 - 2³ = 100405397 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

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, 17541 + ... + 22549.

It is an arithmetic number, because the mean of its divisors is an integer number (7965900).

Almost surely, 2^100405405 is an apocalyptic number.

It is an amenable number.

100405405 is a deficient number, since it is larger than the sum of its proper divisors (27048995).

100405405 is a wasteful number, since it uses less digits than its factorization.

100405405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5244.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 100405405 is about 10020.2497473865. The cubic root of 100405405 is about 464.7852787500.

Adding to 100405405 its reverse (504504001), we get a palindrome (604909406).

The spelling of 100405405 in words is "one hundred million, four hundred five thousand, four hundred five".