308400129 has 20 divisors (see below), whose sum is σ = 467580784. Its totient is φ = 202527864.

The previous prime is 308400119. The next prime is 308400137. The reversal of 308400129 is 921004803.

It is not a de Polignac number, because 308400129 - 2⁵ = 308400097 is a prime.

It is a super-2 number, since 2×308400129² = 190221279134433282, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (308400119) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 22987 + ... + 33840.

Almost surely, 2^308400129 is an apocalyptic number.

It is an amenable number.

308400129 is a deficient number, since it is larger than the sum of its proper divisors (159180655).

308400129 is an equidigital number, since it uses as much as digits as its factorization.

308400129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56906 (or 56897 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 308400129 is about 17561.3248076562. The cubic root of 308400129 is about 675.6236606335.

The spelling of 308400129 in words is "three hundred eight million, four hundred thousand, one hundred twenty-nine".