406636138 has 16 divisors (see below), whose sum is σ = 642600000. Its totient is φ = 192454272.

The previous prime is 406636133. The next prime is 406636169. The reversal of 406636138 is 831636604.

It is a junction number, because it is equal to n+sod(n) for n = 406636097 and 406636106.

It is not an unprimeable number, because it can be changed into a prime (406636133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49338 + ... + 56986.

It is an arithmetic number, because the mean of its divisors is an integer number (40162500).

Almost surely, 2^406636138 is an apocalyptic number.

406636138 is a deficient number, since it is larger than the sum of its proper divisors (235963862).

406636138 is a wasteful number, since it uses less digits than its factorization.

406636138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9069.

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 406636138 is about 20165.2210005246. The cubic root of 406636138 is about 740.8585955767.

It can be divided in two parts, 4066 and 36138, that added together give a palindrome (40204).

The spelling of 406636138 in words is "four hundred six million, six hundred thirty-six thousand, one hundred thirty-eight".