781394423 has 8 divisors (see below), whose sum is σ = 797622768. Its totient is φ = 765221184.

The previous prime is 781394417. The next prime is 781394431. The reversal of 781394423 is 324493187.

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

It is a cyclic number.

It is not a de Polignac number, because 781394423 - 2²⁴ = 764617207 is a prime.

It is a super-2 number, since 2×781394423² = 1221154488591005858, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (781394483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15515 + ... + 42467.

It is an arithmetic number, because the mean of its divisors is an integer number (99702846).

Almost surely, 2^781394423 is an apocalyptic number.

781394423 is a deficient number, since it is larger than the sum of its proper divisors (16228345).

781394423 is a wasteful number, since it uses less digits than its factorization.

781394423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27553.

The product of its digits is 145152, while the sum is 41.

The square root of 781394423 is about 27953.4331165243. The cubic root of 781394423 is about 921.0646241106.

The spelling of 781394423 in words is "seven hundred eighty-one million, three hundred ninety-four thousand, four hundred twenty-three".