309749901 has 8 divisors (see below), whose sum is σ = 430956480. Its totient is φ = 197521632.

The previous prime is 309749873. The next prime is 309749927. The reversal of 309749901 is 109947903.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 309749901 - 2¹¹ = 309747853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309749981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2244496 + ... + 2244633.

It is an arithmetic number, because the mean of its divisors is an integer number (53869560).

Almost surely, 2^309749901 is an apocalyptic number.

It is an amenable number.

309749901 is a deficient number, since it is larger than the sum of its proper divisors (121206579).

309749901 is a wasteful number, since it uses less digits than its factorization.

309749901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4489155.

The product of its (nonzero) digits is 61236, while the sum is 42.

The square root of 309749901 is about 17599.7130942524. The cubic root of 309749901 is about 676.6078914170.

The spelling of 309749901 in words is "three hundred nine million, seven hundred forty-nine thousand, nine hundred one".