402421507 has 2 divisors, whose sum is σ = 402421508. Its totient is φ = 402421506.

The previous prime is 402421457. The next prime is 402421511. The reversal of 402421507 is 705124204.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402421507 is a prime.

It is not a weakly prime, because it can be changed into another prime (402421517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201210753 + 201210754.

It is an arithmetic number, because the mean of its divisors is an integer number (201210754).

Almost surely, 2^402421507 is an apocalyptic number.

402421507 is a deficient number, since it is larger than the sum of its proper divisors (1).

402421507 is an equidigital number, since it uses as much as digits as its factorization.

402421507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 402421507 is about 20060.4463310266. The cubic root of 402421507 is about 738.2901275049.

The spelling of 402421507 in words is "four hundred two million, four hundred twenty-one thousand, five hundred seven".