1990219012 has 6 divisors (see below), whose sum is σ = 3482883278. Its totient is φ = 995109504.

The previous prime is 1990218943. The next prime is 1990219031. The reversal of 1990219012 is 2109120991.

It can be written as a sum of positive squares in only one way, i.e., 1976335936 + 13883076 = 44456^2 + 3726^2 .

It is a super-2 number, since 2×1990219012² = 7921943431452512288, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 248777373 + ... + 248777380.

Almost surely, 2^1990219012 is an apocalyptic number.

It is an amenable number.

1990219012 is a deficient number, since it is larger than the sum of its proper divisors (1492664266).

1990219012 is a wasteful number, since it uses less digits than its factorization.

1990219012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497554757 (or 497554755 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 34.

The square root of 1990219012 is about 44611.8707520767. The cubic root of 1990219012 is about 1257.8638138294.

The spelling of 1990219012 in words is "one billion, nine hundred ninety million, two hundred nineteen thousand, twelve".