1020001900 has 36 divisors (see below), whose sum is σ = 2221342200. Its totient is φ = 406537600.

The previous prime is 1020001867. The next prime is 1020001919. The reversal of 1020001900 is 91000201.

It is a super-2 number, since 2×1020001900² = 2080807752007220000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9951 + ... + 46249.

It is an arithmetic number, because the mean of its divisors is an integer number (61703950).

Almost surely, 2^1020001900 is an apocalyptic number.

1020001900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1020001900 is an abundant number, since it is smaller than the sum of its proper divisors (1201340300).

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

1020001900 is a wasteful number, since it uses less digits than its factorization.

1020001900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36594 (or 36587 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 1020001900 is about 31937.4685909826. The cubic root of 1020001900 is about 1006.6233345869.

The spelling of 1020001900 in words is "one billion, twenty million, one thousand, nine hundred".