406620405 has 24 divisors (see below), whose sum is σ = 730914912. Its totient is φ = 216863568.

The previous prime is 406620391. The next prime is 406620407. The reversal of 406620405 is 504026604.

It is a happy number.

It is not a de Polignac number, because 406620405 - 2¹⁴ = 406604021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406620407) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 166119 + ... + 168548.

It is an arithmetic number, because the mean of its divisors is an integer number (30454788).

Almost surely, 2^406620405 is an apocalyptic number.

406620405 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

406620405 is a deficient number, since it is larger than the sum of its proper divisors (324294507).

406620405 is an equidigital number, since it uses as much as digits as its factorization.

406620405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334687 (or 334675 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 406620405 is about 20164.8308944062. The cubic root of 406620405 is about 740.8490406966.

The spelling of 406620405 in words is "four hundred six million, six hundred twenty thousand, four hundred five".