391224842 has 16 divisors (see below), whose sum is σ = 631546632. Its totient is φ = 181086720.

The previous prime is 391224833. The next prime is 391224863. The reversal of 391224842 is 248422193.

It can be written as a sum of positive squares in 4 ways, for example, as 266701561 + 124523281 = 16331^2 + 11159^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92243 + ... + 96390.

Almost surely, 2^391224842 is an apocalyptic number.

391224842 is a deficient number, since it is larger than the sum of its proper divisors (240321790).

391224842 is a wasteful number, since it uses less digits than its factorization.

391224842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188713.

The product of its digits is 27648, while the sum is 35.

The square root of 391224842 is about 19779.4044905300. The cubic root of 391224842 is about 731.3784189005.

The spelling of 391224842 in words is "three hundred ninety-one million, two hundred twenty-four thousand, eight hundred forty-two".