400078989 has 12 divisors (see below), whose sum is σ = 585208000. Its totient is φ = 263342664.

The previous prime is 400078981. The next prime is 400079011. The reversal of 400078989 is 989870004.

It is not a de Polignac number, because 400078989 - 2³ = 400078981 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400078981) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 280639 + ... + 282060.

Almost surely, 2^400078989 is an apocalyptic number.

It is an amenable number.

400078989 is a deficient number, since it is larger than the sum of its proper divisors (185129011).

400078989 is a wasteful number, since it uses less digits than its factorization.

400078989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562784 (or 562781 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 400078989 is about 20001.9746275212. The cubic root of 400078989 is about 736.8547961967.

The spelling of 400078989 in words is "four hundred million, seventy-eight thousand, nine hundred eighty-nine".