400455890 has 8 divisors (see below), whose sum is σ = 720820620. Its totient is φ = 160182352.

The previous prime is 400455883. The next prime is 400455901. The reversal of 400455890 is 98554004.

It can be written as a sum of positive squares in 2 ways, for example, as 371371441 + 29084449 = 19271^2 + 5393^2 .

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 400455890.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20022785 + ... + 20022804.

Almost surely, 2^400455890 is an apocalyptic number.

400455890 is a deficient number, since it is larger than the sum of its proper divisors (320364730).

400455890 is a wasteful number, since it uses less digits than its factorization.

400455890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40045596.

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 400455890 is about 20011.3940044166. The cubic root of 400455890 is about 737.0861123052.

The spelling of 400455890 in words is "four hundred million, four hundred fifty-five thousand, eight hundred ninety".