1990623892 has 12 divisors (see below), whose sum is σ = 3542636160. Its totient is φ = 978442136.

The previous prime is 1990623851. The next prime is 1990623911. The reversal of 1990623892 is 2983260991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4217188 + ... + 4217659.

It is an arithmetic number, because the mean of its divisors is an integer number (295219680).

Almost surely, 2^1990623892 is an apocalyptic number.

It is an amenable number.

1990623892 is a deficient number, since it is larger than the sum of its proper divisors (1552012268).

1990623892 is a wasteful number, since it uses less digits than its factorization.

1990623892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8434910 (or 8434908 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 49.

The square root of 1990623892 is about 44616.4083269821. The cubic root of 1990623892 is about 1257.9491058444.

The spelling of 1990623892 in words is "one billion, nine hundred ninety million, six hundred twenty-three thousand, eight hundred ninety-two".