1990397002 has 12 divisors (see below), whose sum is σ = 3281688018. Its totient is φ = 904725800.

The previous prime is 1990396963. The next prime is 1990397011. The reversal of 1990397002 is 2007930991.

It can be written as a sum of positive squares in only one way, i.e., 1664558401 + 325838601 = 40799^2 + 18051^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4112149 + ... + 4112632.

Almost surely, 2^1990397002 is an apocalyptic number.

1990397002 is a deficient number, since it is larger than the sum of its proper divisors (1291291016).

1990397002 is a wasteful number, since it uses less digits than its factorization.

1990397002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8224805 (or 8224794 counting only the distinct ones).

The product of its (nonzero) digits is 30618, while the sum is 40.

The square root of 1990397002 is about 44613.8655801086. The cubic root of 1990397002 is about 1257.9013106250.

The spelling of 1990397002 in words is "one billion, nine hundred ninety million, three hundred ninety-seven thousand, two".