1018990800 has 120 divisors (see below), whose sum is σ = 3626890880. Its totient is φ = 271728000.

The previous prime is 1018990771. The next prime is 1018990813. The reversal of 1018990800 is 80998101.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36376 + ... + 57975.

Almost surely, 2^1018990800 is an apocalyptic number.

1018990800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1018990800 is an abundant number, since it is smaller than the sum of its proper divisors (2607900080).

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

1018990800 is a wasteful number, since it uses less digits than its factorization.

1018990800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94378 (or 94361 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 36.

The square root of 1018990800 is about 31921.6352964569. The cubic root of 1018990800 is about 1006.2906118918.

The spelling of 1018990800 in words is "one billion, eighteen million, nine hundred ninety thousand, eight hundred".