402420253 has 2 divisors, whose sum is σ = 402420254. Its totient is φ = 402420252.

The previous prime is 402420229. The next prime is 402420257. The reversal of 402420253 is 352024204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 227466724 + 174953529 = 15082^2 + 13227^2 .

It is a cyclic number.

It is not a de Polignac number, because 402420253 - 2⁹ = 402419741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402420257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201210126 + 201210127.

It is an arithmetic number, because the mean of its divisors is an integer number (201210127).

Almost surely, 2^402420253 is an apocalyptic number.

It is an amenable number.

402420253 is a deficient number, since it is larger than the sum of its proper divisors (1).

402420253 is an equidigital number, since it uses as much as digits as its factorization.

402420253 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 402420253 is about 20060.4150754664. The cubic root of 402420253 is about 738.2893606334.

Adding to 402420253 its reverse (352024204), we get a palindrome (754444457).

The spelling of 402420253 in words is "four hundred two million, four hundred twenty thousand, two hundred fifty-three".