391140542 has 16 divisors (see below), whose sum is σ = 648920832. Its totient is φ = 175646880.

The previous prime is 391140523. The next prime is 391140551. The reversal of 391140542 is 245041193.

It is a congruent number.

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, 202334 + ... + 204257.

It is an arithmetic number, because the mean of its divisors is an integer number (40557552).

Almost surely, 2^391140542 is an apocalyptic number.

391140542 is a deficient number, since it is larger than the sum of its proper divisors (257780290).

391140542 is a wasteful number, since it uses less digits than its factorization.

391140542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406643.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 391140542 is about 19777.2733712208. The cubic root of 391140542 is about 731.3258833566.

The spelling of 391140542 in words is "three hundred ninety-one million, one hundred forty thousand, five hundred forty-two".