308400853 has 2 divisors, whose sum is σ = 308400854. Its totient is φ = 308400852.

The previous prime is 308400839. The next prime is 308400871. The reversal of 308400853 is 358004803.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 268369924 + 40030929 = 16382^2 + 6327^2 .

It is a cyclic number.

It is not a de Polignac number, because 308400853 - 2²⁵ = 274846421 is a prime.

It is a super-2 number, since 2×308400853² = 190222172262255218, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (308401853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154200426 + 154200427.

It is an arithmetic number, because the mean of its divisors is an integer number (154200427).

Almost surely, 2^308400853 is an apocalyptic number.

It is an amenable number.

308400853 is a deficient number, since it is larger than the sum of its proper divisors (1).

308400853 is an equidigital number, since it uses as much as digits as its factorization.

308400853 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 308400853 is about 17561.3454211231. The cubic root of 308400853 is about 675.6241893310.

The spelling of 308400853 in words is "three hundred eight million, four hundred thousand, eight hundred fifty-three".