402850993 has 2 divisors, whose sum is σ = 402850994. Its totient is φ = 402850992.

The previous prime is 402850979. The next prime is 402851027. The reversal of 402850993 is 399058204.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 376049664 + 26801329 = 19392^2 + 5177^2 .

It is a cyclic number.

It is not a de Polignac number, because 402850993 - 2¹³ = 402842801 is a prime.

It is a super-2 number, since 2×402850993² = 324577845122172098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (402850193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201425496 + 201425497.

It is an arithmetic number, because the mean of its divisors is an integer number (201425497).

Almost surely, 2^402850993 is an apocalyptic number.

It is an amenable number.

402850993 is a deficient number, since it is larger than the sum of its proper divisors (1).

402850993 is an equidigital number, since it uses as much as digits as its factorization.

402850993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 402850993 is about 20071.1482730809. The cubic root of 402850993 is about 738.5526818429.

The spelling of 402850993 in words is "four hundred two million, eight hundred fifty thousand, nine hundred ninety-three".