309442 has 24 divisors (see below), whose sum is σ = 571968. Its totient is φ = 122760.

The previous prime is 309437. The next prime is 309457. The reversal of 309442 is 244903.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

309442 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9967 + ... + 9997.

It is an arithmetic number, because the mean of its divisors is an integer number (23832).

2³⁰⁹⁴⁴² is an apocalyptic number.

309442 is a deficient number, since it is larger than the sum of its proper divisors (262526).

309442 is a wasteful number, since it uses less digits than its factorization.

309442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94 (or 63 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 309442 is about 556.2751117927. The cubic root of 309442 is about 67.6383627355.

It can be divided in two parts, 3094 and 42, that added together give a square (3136 = 56²).

The spelling of 309442 in words is "three hundred nine thousand, four hundred forty-two".