309942871 has 32 divisors (see below), whose sum is σ = 382279680. Its totient is φ = 245573856.

The previous prime is 309942851. The next prime is 309942881. The reversal of 309942871 is 178249903.

It is a cyclic number.

It is not a de Polignac number, because 309942871 - 2¹³ = 309934679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309942811) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 636190 + ... + 636676.

It is an arithmetic number, because the mean of its divisors is an integer number (11946240).

Almost surely, 2^309942871 is an apocalyptic number.

309942871 is a deficient number, since it is larger than the sum of its proper divisors (72336809).

309942871 is a wasteful number, since it uses less digits than its factorization.

309942871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 309942871 is about 17605.1944323259. The cubic root of 309942871 is about 676.7483681052.

The spelling of 309942871 in words is "three hundred nine million, nine hundred forty-two thousand, eight hundred seventy-one".