406635623 has 4 divisors (see below), whose sum is σ = 412206048. Its totient is φ = 401065200.

The previous prime is 406635583. The next prime is 406635637. The reversal of 406635623 is 326536604.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 406635623 - 2¹² = 406631527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406635683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2785103 + ... + 2785248.

It is an arithmetic number, because the mean of its divisors is an integer number (103051512).

Almost surely, 2^406635623 is an apocalyptic number.

406635623 is a deficient number, since it is larger than the sum of its proper divisors (5570425).

406635623 is an equidigital number, since it uses as much as digits as its factorization.

406635623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5570424.

The product of its (nonzero) digits is 77760, while the sum is 35.

The square root of 406635623 is about 20165.2082310102. The cubic root of 406635623 is about 740.8582828136.

The spelling of 406635623 in words is "four hundred six million, six hundred thirty-five thousand, six hundred twenty-three".