402270217 has 2 divisors, whose sum is σ = 402270218. Its totient is φ = 402270216.

The previous prime is 402270199. The next prime is 402270233. The reversal of 402270217 is 712072204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 316448521 + 85821696 = 17789^2 + 9264^2 .

It is a cyclic number.

It is not a de Polignac number, because 402270217 - 2¹¹ = 402268169 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 402270191 and 402270200.

It is not a weakly prime, because it can be changed into another prime (402270287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201135108 + 201135109.

It is an arithmetic number, because the mean of its divisors is an integer number (201135109).

Almost surely, 2^402270217 is an apocalyptic number.

It is an amenable number.

402270217 is a deficient number, since it is larger than the sum of its proper divisors (1).

402270217 is an equidigital number, since it uses as much as digits as its factorization.

402270217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1568, while the sum is 25.

The square root of 402270217 is about 20056.6751232601. The cubic root of 402270217 is about 738.1975960740.

The spelling of 402270217 in words is "four hundred two million, two hundred seventy thousand, two hundred seventeen".