403925681 has 2 divisors, whose sum is σ = 403925682. Its totient is φ = 403925680.

The previous prime is 403925677. The next prime is 403925719. The reversal of 403925681 is 186529304.

It is a happy number.

It is an a-pointer prime, because the next prime (403925719) can be obtained adding 403925681 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 254083600 + 149842081 = 15940^2 + 12241^2 .

It is a cyclic number.

It is not a de Polignac number, because 403925681 - 2² = 403925677 is a prime.

It is a super-2 number, since 2×403925681² = 326311911542627522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (403925611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201962840 + 201962841.

It is an arithmetic number, because the mean of its divisors is an integer number (201962841).

Almost surely, 2^403925681 is an apocalyptic number.

It is an amenable number.

403925681 is a deficient number, since it is larger than the sum of its proper divisors (1).

403925681 is an equidigital number, since it uses as much as digits as its factorization.

403925681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 403925681 is about 20097.9024029872. The cubic root of 403925681 is about 739.2088458375.

The spelling of 403925681 in words is "four hundred three million, nine hundred twenty-five thousand, six hundred eighty-one".