781809942 has 8 divisors (see below), whose sum is σ = 1563619896. Its totient is φ = 260603312.

The previous prime is 781809913. The next prime is 781809949. The reversal of 781809942 is 249908187.

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

781809942 is an admirable number.

It is a super-2 number, since 2×781809942² = 1222453570820086728, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 781809891 and 781809900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (781809949) 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, 65150823 + ... + 65150834.

It is an arithmetic number, because the mean of its divisors is an integer number (195452487).

Almost surely, 2^781809942 is an apocalyptic number.

781809942 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

781809942 is a wasteful number, since it uses less digits than its factorization.

781809942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130301662.

The product of its (nonzero) digits is 290304, while the sum is 48.

The square root of 781809942 is about 27960.8644716146. The cubic root of 781809942 is about 921.2278588020.

The spelling of 781809942 in words is "seven hundred eighty-one million, eight hundred nine thousand, nine hundred forty-two".