1815400146 has 64 divisors (see below), whose sum is σ = 4233139200. Its totient is φ = 508286016.

The previous prime is 1815400133. The next prime is 1815400177. The reversal of 1815400146 is 6410045181.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 938196 + ... + 940128.

It is an arithmetic number, because the mean of its divisors is an integer number (66142800).

Almost surely, 2^1815400146 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1815400146, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2116569600).

1815400146 is an abundant number, since it is smaller than the sum of its proper divisors (2417739054).

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

1815400146 is a wasteful number, since it uses less digits than its factorization.

1815400146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2383.

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 1815400146 is about 42607.5127882396. The cubic root of 1815400146 is about 1219.8996929983.

The spelling of 1815400146 in words is "one billion, eight hundred fifteen million, four hundred thousand, one hundred forty-six".