400574989 has 4 divisors (see below), whose sum is σ = 404541180. Its totient is φ = 396608800.

The previous prime is 400574959. The next prime is 400575001. The reversal of 400574989 is 989475004.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 297390025 + 103184964 = 17245^2 + 10158^2 .

It is a cyclic number.

It is not a de Polignac number, because 400574989 - 2⁵ = 400574957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400574939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1982944 + ... + 1983145.

It is an arithmetic number, because the mean of its divisors is an integer number (101135295).

Almost surely, 2^400574989 is an apocalyptic number.

It is an amenable number.

400574989 is a deficient number, since it is larger than the sum of its proper divisors (3966191).

400574989 is a wasteful number, since it uses less digits than its factorization.

400574989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3966190.

The product of its (nonzero) digits is 362880, while the sum is 46.

The square root of 400574989 is about 20014.3695628916. The cubic root of 400574989 is about 737.1591769628.

The spelling of 400574989 in words is "four hundred million, five hundred seventy-four thousand, nine hundred eighty-nine".