400604989 has 2 divisors, whose sum is σ = 400604990. Its totient is φ = 400604988.

The previous prime is 400604977. The next prime is 400605011. The reversal of 400604989 is 989406004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 362597764 + 38007225 = 19042^2 + 6165^2 .

It is a cyclic number.

It is not a de Polignac number, because 400604989 - 2⁷ = 400604861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400604959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200302494 + 200302495.

It is an arithmetic number, because the mean of its divisors is an integer number (200302495).

Almost surely, 2^400604989 is an apocalyptic number.

It is an amenable number.

400604989 is a deficient number, since it is larger than the sum of its proper divisors (1).

400604989 is an equidigital number, since it uses as much as digits as its factorization.

400604989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 400604989 is about 20015.1190103881. The cubic root of 400604989 is about 737.1775790298.

The spelling of 400604989 in words is "four hundred million, six hundred four thousand, nine hundred eighty-nine".