309207401 has 4 divisors (see below), whose sum is σ = 309353172. Its totient is φ = 309061632.

The previous prime is 309207391. The next prime is 309207403. The reversal of 309207401 is 104702903.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 104702903 = 31 ⋅3377513.

It can be written as a sum of positive squares in 2 ways, for example, as 68492176 + 240715225 = 8276^2 + 15515^2 .

It is a cyclic number.

It is not a de Polignac number, because 309207401 - 2⁶ = 309207337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (309207403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69656 + ... + 73961.

It is an arithmetic number, because the mean of its divisors is an integer number (77338293).

Almost surely, 2^309207401 is an apocalyptic number.

It is an amenable number.

309207401 is a deficient number, since it is larger than the sum of its proper divisors (145771).

309207401 is a wasteful number, since it uses less digits than its factorization.

309207401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145770.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 309207401 is about 17584.2941570027. The cubic root of 309207401 is about 676.2126539692.

The spelling of 309207401 in words is "three hundred nine million, two hundred seven thousand, four hundred one".