402940724581 has 2 divisors, whose sum is σ = 402940724582. Its totient is φ = 402940724580.

The previous prime is 402940724573. The next prime is 402940724587. The reversal of 402940724581 is 185427049204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 220837964356 + 182102760225 = 469934^2 + 426735^2 .

It is a cyclic number.

It is not a de Polignac number, because 402940724581 - 2³ = 402940724573 is a prime.

It is a super-2 number, since 2×402940724581² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402940724587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201470362290 + 201470362291.

It is an arithmetic number, because the mean of its divisors is an integer number (201470362291).

Almost surely, 2^402940724581 is an apocalyptic number.

It is an amenable number.

402940724581 is a deficient number, since it is larger than the sum of its proper divisors (1).

402940724581 is an equidigital number, since it uses as much as digits as its factorization.

402940724581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 645120, while the sum is 46.

The spelling of 402940724581 in words is "four hundred two billion, nine hundred forty million, seven hundred twenty-four thousand, five hundred eighty-one".