402342431 has 2 divisors, whose sum is σ = 402342432. Its totient is φ = 402342430.

The previous prime is 402342377. The next prime is 402342481. The reversal of 402342431 is 134243204.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402342431 is a prime.

It is a super-2 number, since 2×402342431² = 323758863565979522, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 402342397 and 402342406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402342481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201171215 + 201171216.

It is an arithmetic number, because the mean of its divisors is an integer number (201171216).

Almost surely, 2^402342431 is an apocalyptic number.

402342431 is a deficient number, since it is larger than the sum of its proper divisors (1).

402342431 is an equidigital number, since it uses as much as digits as its factorization.

402342431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 402342431 is about 20058.4752910085. The cubic root of 402342431 is about 738.2417662275.

Adding to 402342431 its reverse (134243204), we get a palindrome (536585635).

The spelling of 402342431 in words is "four hundred two million, three hundred forty-two thousand, four hundred thirty-one".