309620401 has 4 divisors (see below), whose sum is σ = 310215204. Its totient is φ = 309025600.

The previous prime is 309620357. The next prime is 309620407. The reversal of 309620401 is 104026903.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 104026903 = 7393 ⋅14071.

It can be written as a sum of positive squares in 2 ways, for example, as 77088400 + 232532001 = 8780^2 + 15249^2 .

It is a cyclic number.

It is not a de Polignac number, because 309620401 - 2²⁵ = 276065969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (309620407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 296620 + ... + 297661.

It is an arithmetic number, because the mean of its divisors is an integer number (77553801).

Almost surely, 2^309620401 is an apocalyptic number.

It is an amenable number.

309620401 is a deficient number, since it is larger than the sum of its proper divisors (594803).

309620401 is an equidigital number, since it uses as much as digits as its factorization.

309620401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594802.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 309620401 is about 17596.0336723933. The cubic root of 309620401 is about 676.5135863714.

The spelling of 309620401 in words is "three hundred nine million, six hundred twenty thousand, four hundred one".