408400381 has 2 divisors, whose sum is σ = 408400382. Its totient is φ = 408400380.

The previous prime is 408400357. The next prime is 408400411. The reversal of 408400381 is 183004804.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 267028281 + 141372100 = 16341^2 + 11890^2 .

It is a cyclic number.

It is not a de Polignac number, because 408400381 - 2²⁵ = 374845949 is a prime.

It is a super-2 number, since 2×408400381² = 333581742401890322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (408400781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204200190 + 204200191.

It is an arithmetic number, because the mean of its divisors is an integer number (204200191).

Almost surely, 2^408400381 is an apocalyptic number.

It is an amenable number.

408400381 is a deficient number, since it is larger than the sum of its proper divisors (1).

408400381 is an equidigital number, since it uses as much as digits as its factorization.

408400381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 408400381 is about 20208.9183530440. The cubic root of 408400381 is about 741.9284864346.

The spelling of 408400381 in words is "four hundred eight million, four hundred thousand, three hundred eighty-one".