200390981 has 4 divisors (see below), whose sum is σ = 229018272. Its totient is φ = 171763692.

The previous prime is 200390959. The next prime is 200390987. The reversal of 200390981 is 189093002.

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 not a de Polignac number, because 200390981 - 2²⁶ = 133282117 is a prime.

It is a super-2 number, since 2×200390981² = 80313090532284722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200390987) 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, 14313635 + ... + 14313648.

It is an arithmetic number, because the mean of its divisors is an integer number (57254568).

Almost surely, 2^200390981 is an apocalyptic number.

It is an amenable number.

200390981 is a deficient number, since it is larger than the sum of its proper divisors (28627291).

200390981 is an equidigital number, since it uses as much as digits as its factorization.

200390981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28627290.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 200390981 is about 14155.9521403542. The cubic root of 200390981 is about 585.1843780476.

The spelling of 200390981 in words is "two hundred million, three hundred ninety thousand, nine hundred eighty-one".