402906121 has 2 divisors, whose sum is σ = 402906122. Its totient is φ = 402906120.

The previous prime is 402906113. The next prime is 402906131. The reversal of 402906121 is 121609204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 402443721 + 462400 = 20061^2 + 680^2 .

It is a cyclic number.

It is not a de Polignac number, because 402906121 - 2³ = 402906113 is a prime.

It is not a weakly prime, because it can be changed into another prime (402906131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201453060 + 201453061.

It is an arithmetic number, because the mean of its divisors is an integer number (201453061).

Almost surely, 2^402906121 is an apocalyptic number.

It is an amenable number.

402906121 is a deficient number, since it is larger than the sum of its proper divisors (1).

402906121 is an equidigital number, since it uses as much as digits as its factorization.

402906121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 402906121 is about 20072.5215406535. The cubic root of 402906121 is about 738.5863692988.

The spelling of 402906121 in words is "four hundred two million, nine hundred six thousand, one hundred twenty-one".