308402189 has 2 divisors, whose sum is σ = 308402190. Its totient is φ = 308402188.

The previous prime is 308402183. The next prime is 308402197. The reversal of 308402189 is 981204803.

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., 279993289 + 28408900 = 16733^2 + 5330^2 .

It is a cyclic number.

It is not a de Polignac number, because 308402189 - 2²⁴ = 291624973 is a prime.

It is a super-2 number, since 2×308402189² = 190223820359983442, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (308402183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154201094 + 154201095.

It is an arithmetic number, because the mean of its divisors is an integer number (154201095).

Almost surely, 2^308402189 is an apocalyptic number.

It is an amenable number.

308402189 is a deficient number, since it is larger than the sum of its proper divisors (1).

308402189 is an equidigital number, since it uses as much as digits as its factorization.

308402189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 308402189 is about 17561.3834591697. The cubic root of 308402189 is about 675.6251649364.

The spelling of 308402189 in words is "three hundred eight million, four hundred two thousand, one hundred eighty-nine".