391945426 has 8 divisors (see below), whose sum is σ = 588432384. Its totient is φ = 195801300.

The previous prime is 391945423. The next prime is 391945439. The reversal of 391945426 is 624549193.

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

It is a super-3 number, since 3×391945426³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (391945423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82830 + ... + 87433.

It is an arithmetic number, because the mean of its divisors is an integer number (73554048).

Almost surely, 2^391945426 is an apocalyptic number.

391945426 is a deficient number, since it is larger than the sum of its proper divisors (196486958).

391945426 is a wasteful number, since it uses less digits than its factorization.

391945426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171416.

The product of its digits is 233280, while the sum is 43.

The square root of 391945426 is about 19797.6116236277. The cubic root of 391945426 is about 731.8271773417.

The spelling of 391945426 in words is "three hundred ninety-one million, nine hundred forty-five thousand, four hundred twenty-six".