391212394 has 8 divisors (see below), whose sum is σ = 617703840. Its totient is φ = 185311116.

The previous prime is 391212391. The next prime is 391212401. The reversal of 391212394 is 493212193.

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

It is a super-2 number, since 2×391212394² = 306094274438422472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (391212391) 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, 5147494 + ... + 5147569.

It is an arithmetic number, because the mean of its divisors is an integer number (77212980).

Almost surely, 2^391212394 is an apocalyptic number.

391212394 is a deficient number, since it is larger than the sum of its proper divisors (226491446).

391212394 is a wasteful number, since it uses less digits than its factorization.

391212394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10295084.

The product of its digits is 11664, while the sum is 34.

The square root of 391212394 is about 19779.0898172793. The cubic root of 391212394 is about 731.3706618138.

The spelling of 391212394 in words is "three hundred ninety-one million, two hundred twelve thousand, three hundred ninety-four".