408420631 has 4 divisors (see below), whose sum is σ = 432445392. Its totient is φ = 384395872.

The previous prime is 408420589. The next prime is 408420641. The reversal of 408420631 is 136024804.

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 408420631 - 2¹⁷ = 408289559 is a prime.

It is a super-2 number, since 2×408420631² = 333614823652876322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 408420631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (408420641) 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, 12012355 + ... + 12012388.

It is an arithmetic number, because the mean of its divisors is an integer number (108111348).

Almost surely, 2^408420631 is an apocalyptic number.

408420631 is a deficient number, since it is larger than the sum of its proper divisors (24024761).

408420631 is a wasteful number, since it uses less digits than its factorization.

408420631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24024760.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 408420631 is about 20209.4193632573. The cubic root of 408420631 is about 741.9407487506.

The spelling of 408420631 in words is "four hundred eight million, four hundred twenty thousand, six hundred thirty-one".