406213903 has 4 divisors (see below), whose sum is σ = 414856800. Its totient is φ = 397571008.

The previous prime is 406213891. The next prime is 406213909. The reversal of 406213903 is 309312604.

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 406213903 - 2²¹ = 404116751 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 (406213909) 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, 4321378 + ... + 4321471.

It is an arithmetic number, because the mean of its divisors is an integer number (103714200).

Almost surely, 2^406213903 is an apocalyptic number.

406213903 is a deficient number, since it is larger than the sum of its proper divisors (8642897).

406213903 is an equidigital number, since it uses as much as digits as its factorization.

406213903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8642896.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 406213903 is about 20154.7488944913. The cubic root of 406213903 is about 740.6020806120.

The spelling of 406213903 in words is "four hundred six million, two hundred thirteen thousand, nine hundred three".