402323991623 has 2 divisors, whose sum is σ = 402323991624. Its totient is φ = 402323991622.

The previous prime is 402323991593. The next prime is 402323991631. The reversal of 402323991623 is 326199323204.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 402323991623 - 2⁸ = 402323991367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402323991673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201161995811 + 201161995812.

It is an arithmetic number, because the mean of its divisors is an integer number (201161995812).

Almost surely, 2^402323991623 is an apocalyptic number.

402323991623 is a deficient number, since it is larger than the sum of its proper divisors (1).

402323991623 is an equidigital number, since it uses as much as digits as its factorization.

402323991623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 419904, while the sum is 44.

The spelling of 402323991623 in words is "four hundred two billion, three hundred twenty-three million, nine hundred ninety-one thousand, six hundred twenty-three".