781242 has 64 divisors (see below), whose sum is σ = 2073600. Its totient is φ = 190080.

The previous prime is 781229. The next prime is 781243. The reversal of 781242 is 242187.

781242 is nontrivially palindromic in base 8.

It is a super-2 number, since 2×781242² = 1220678125128, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (781243) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8734 + ... + 8822.

It is an arithmetic number, because the mean of its divisors is an integer number (32400).

781242 is a Friedman number, since it can be written as ((7-2*1)^8-4)*2, using all its digits and the basic arithmetic operations.

2⁷⁸¹²⁴² is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 781242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1036800).

781242 is an abundant number, since it is smaller than the sum of its proper divisors (1292358).

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

781242 is a wasteful number, since it uses less digits than its factorization.

781242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131.

The product of its digits is 896, while the sum is 24.

The square root of 781242 is about 883.8789509882. The cubic root of 781242 is about 92.1004730942.

The spelling of 781242 in words is "seven hundred eighty-one thousand, two hundred forty-two".