408220639 has 2 divisors, whose sum is σ = 408220640. Its totient is φ = 408220638.

The previous prime is 408220633. The next prime is 408220649. The reversal of 408220639 is 936022804.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 408220639 - 2¹³ = 408212447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (408220633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204110319 + 204110320.

It is an arithmetic number, because the mean of its divisors is an integer number (204110320).

Almost surely, 2^408220639 is an apocalyptic number.

408220639 is a deficient number, since it is larger than the sum of its proper divisors (1).

408220639 is an equidigital number, since it uses as much as digits as its factorization.

408220639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 408220639 is about 20204.4707676296. The cubic root of 408220639 is about 741.8196265308.

The spelling of 408220639 in words is "four hundred eight million, two hundred twenty thousand, six hundred thirty-nine".