406623689 has 2 divisors, whose sum is σ = 406623690. Its totient is φ = 406623688.

The previous prime is 406623661. The next prime is 406623733. The reversal of 406623689 is 986326604.

It is an a-pointer prime, because the next prime (406623733) can be obtained adding 406623689 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 302481664 + 104142025 = 17392^2 + 10205^2 .

It is a cyclic number.

It is not a de Polignac number, because 406623689 - 2²⁴ = 389846473 is a prime.

It is not a weakly prime, because it can be changed into another prime (406623619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203311844 + 203311845.

It is an arithmetic number, because the mean of its divisors is an integer number (203311845).

Almost surely, 2^406623689 is an apocalyptic number.

It is an amenable number.

406623689 is a deficient number, since it is larger than the sum of its proper divisors (1).

406623689 is an equidigital number, since it uses as much as digits as its factorization.

406623689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 44.

The square root of 406623689 is about 20164.9123231419. The cubic root of 406623689 is about 740.8510351380.

The spelling of 406623689 in words is "four hundred six million, six hundred twenty-three thousand, six hundred eighty-nine".