394720109 has 8 divisors (see below), whose sum is σ = 452787840. Its totient is φ = 337072176.

The previous prime is 394720061. The next prime is 394720133. The reversal of 394720109 is 901027493.

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

It is a de Polignac number, because none of the positive numbers 2^k-394720109 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 (394720159) 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, 102929 + ... + 106694.

It is an arithmetic number, because the mean of its divisors is an integer number (56598480).

Almost surely, 2^394720109 is an apocalyptic number.

It is an amenable number.

394720109 is a deficient number, since it is larger than the sum of its proper divisors (58067731).

394720109 is a wasteful number, since it uses less digits than its factorization.

394720109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209899.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 394720109 is about 19867.5642442651. The cubic root of 394720109 is about 733.5500494250.

The spelling of 394720109 in words is "three hundred ninety-four million, seven hundred twenty thousand, one hundred nine".