400685290 has 8 divisors (see below), whose sum is σ = 721233540. Its totient is φ = 160274112.

The previous prime is 400685279. The next prime is 400685297. The reversal of 400685290 is 92586004.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 392951329 + 7733961 = 19823^2 + 2781^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (400685297) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20034255 + ... + 20034274.

Almost surely, 2^400685290 is an apocalyptic number.

400685290 is a deficient number, since it is larger than the sum of its proper divisors (320548250).

400685290 is a wasteful number, since it uses less digits than its factorization.

400685290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40068536.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 400685290 is about 20017.1249184292. The cubic root of 400685290 is about 737.2268313220.

The spelling of 400685290 in words is "four hundred million, six hundred eighty-five thousand, two hundred ninety".