781340 has 24 divisors (see below), whose sum is σ = 1875552. Its totient is φ = 267840.

The previous prime is 781327. The next prime is 781351. The reversal of 781340 is 43187.

It is a happy number.

It is a super-2 number, since 2×781340² = 1220984391200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2651 + ... + 2930.

It is an arithmetic number, because the mean of its divisors is an integer number (78148).

2⁷⁸¹³⁴⁰ is an apocalyptic number.

781340 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

781340 is an abundant number, since it is smaller than the sum of its proper divisors (1094212).

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

781340 is a wasteful number, since it uses less digits than its factorization.

781340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5597 (or 5595 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 781340 is about 883.9343867053. The cubic root of 781340 is about 92.1043240004.

The spelling of 781340 in words is "seven hundred eighty-one thousand, three hundred forty".