202423409 has 2 divisors, whose sum is σ = 202423410. Its totient is φ = 202423408.

The previous prime is 202423373. The next prime is 202423421. The reversal of 202423409 is 904324202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122589184 + 79834225 = 11072^2 + 8935^2 .

It is a cyclic number.

It is not a de Polignac number, because 202423409 - 2⁸ = 202423153 is a prime.

It is a super-2 number, since 2×202423409² = 81950473022362562, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (202423439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101211704 + 101211705.

It is an arithmetic number, because the mean of its divisors is an integer number (101211705).

Almost surely, 2^202423409 is an apocalyptic number.

It is an amenable number.

202423409 is a deficient number, since it is larger than the sum of its proper divisors (1).

202423409 is an equidigital number, since it uses as much as digits as its factorization.

202423409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 202423409 is about 14227.5580828194. The cubic root of 202423409 is about 587.1561013757.

The spelling of 202423409 in words is "two hundred two million, four hundred twenty-three thousand, four hundred nine".