202423981 has 6 divisors (see below), whose sum is σ = 215032010. Its totient is φ = 190516416.

The previous prime is 202423937. The next prime is 202423987. The reversal of 202423981 is 189324202.

202423981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 20848356 + 181575625 = 4566^2 + 13475^2 .

It is not a de Polignac number, because 202423981 - 2¹⁵ = 202391213 is a prime.

It is a super-2 number, since 2×202423981² = 81950936167776722, 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 (202423987) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 349926 + ... + 350503.

Almost surely, 2^202423981 is an apocalyptic number.

It is an amenable number.

202423981 is a deficient number, since it is larger than the sum of its proper divisors (12608029).

202423981 is an equidigital number, since it uses as much as digits as its factorization.

202423981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700463 (or 700446 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 202423981 is about 14227.5781846385. The cubic root of 202423981 is about 587.1566544293.

The spelling of 202423981 in words is "two hundred two million, four hundred twenty-three thousand, nine hundred eighty-one".