400843146 has 64 divisors (see below), whose sum is σ = 892717056. Its totient is φ = 118972800.

The previous prime is 400843141. The next prime is 400843147. The reversal of 400843146 is 641348004.

It is not an unprimeable number, because it can be changed into a prime (400843141) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1305525 + ... + 1305831.

It is an arithmetic number, because the mean of its divisors is an integer number (13948704).

Almost surely, 2^400843146 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400843146, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (446358528).

400843146 is an abundant number, since it is smaller than the sum of its proper divisors (491873910).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400843146 is a wasteful number, since it uses less digits than its factorization.

400843146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667.

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 400843146 is about 20021.0675539543. The cubic root of 400843146 is about 737.3236324793.

The spelling of 400843146 in words is "four hundred million, eight hundred forty-three thousand, one hundred forty-six".