1990325653 has 4 divisors (see below), whose sum is σ = 1999758688. Its totient is φ = 1980892620.

The previous prime is 1990325633. The next prime is 1990325669. The reversal of 1990325653 is 3565230991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1990325653 is a prime.

It is a super-2 number, since 2×1990325653² = 7922792409979752818, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990325633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4716201 + ... + 4716622.

It is an arithmetic number, because the mean of its divisors is an integer number (499939672).

Almost surely, 2^1990325653 is an apocalyptic number.

It is an amenable number.

1990325653 is a deficient number, since it is larger than the sum of its proper divisors (9433035).

1990325653 is an equidigital number, since it uses as much as digits as its factorization.

1990325653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9433034.

The product of its (nonzero) digits is 218700, while the sum is 43.

The square root of 1990325653 is about 44613.0659448552. The cubic root of 1990325653 is about 1257.8862799430.

The spelling of 1990325653 in words is "one billion, nine hundred ninety million, three hundred twenty-five thousand, six hundred fifty-three".