781140042 has 24 divisors (see below), whose sum is σ = 1693535844. Its totient is φ = 260216064.

The previous prime is 781140037. The next prime is 781140091. The reversal of 781140042 is 240041187.

It can be written as a sum of positive squares in 2 ways, for example, as 767234601 + 13905441 = 27699^2 + 3729^2 .

It is a super-2 number, since 2×781140042² = 1220359530431523528, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 781139988 and 781140015.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17658 + ... + 43290.

Almost surely, 2^781140042 is an apocalyptic number.

781140042 is an abundant number, since it is smaller than the sum of its proper divisors (912395802).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

781140042 is a wasteful number, since it uses less digits than its factorization.

781140042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27334 (or 27331 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 781140042 is about 27948.8826610296. The cubic root of 781140042 is about 920.9646631676.

The spelling of 781140042 in words is "seven hundred eighty-one million, one hundred forty thousand, forty-two".