400803018 has 64 divisors (see below), whose sum is σ = 1026459648. Its totient is φ = 101286720.

The previous prime is 400802959. The next prime is 400803019. The reversal of 400803018 is 810308004.

It is not an unprimeable number, because it can be changed into a prime (400803019) 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, 5371 + ... + 28817.

It is an arithmetic number, because the mean of its divisors is an integer number (16038432).

Almost surely, 2^400803018 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400803018, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (513229824).

400803018 is an abundant number, since it is smaller than the sum of its proper divisors (625656630).

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

400803018 is a wasteful number, since it uses less digits than its factorization.

400803018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23507.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 400803018 is about 20020.0653845086. The cubic root of 400803018 is about 737.2990274184.

The spelling of 400803018 in words is "four hundred million, eight hundred three thousand, eighteen".