391000387742 has 16 divisors (see below), whose sum is σ = 608798659392. Its totient is φ = 188203881120.

The previous prime is 391000387727. The next prime is 391000387747. The reversal of 391000387742 is 247783000193.

It is a junction number, because it is equal to n+sod(n) for n = 391000387693 and 391000387702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391000387747) 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, 34089173 + ... + 34100640.

It is an arithmetic number, because the mean of its divisors is an integer number (38049916212).

Almost surely, 2^391000387742 is an apocalyptic number.

391000387742 is a deficient number, since it is larger than the sum of its proper divisors (217798271650).

391000387742 is a wasteful number, since it uses less digits than its factorization.

391000387742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68189923.

The product of its (nonzero) digits is 254016, while the sum is 44.

The spelling of 391000387742 in words is "three hundred ninety-one billion, three hundred eighty-seven thousand, seven hundred forty-two".