1781426136 has 128 divisors (see below), whose sum is σ = 5177433600. Its totient is φ = 500290560.

The previous prime is 1781426099. The next prime is 1781426159. The reversal of 1781426136 is 6316241871.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1781426094 and 1781426103.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 4231206 + ... + 4231626.

It is an arithmetic number, because the mean of its divisors is an integer number (40448700).

Almost surely, 2^1781426136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1781426136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2588716800).

1781426136 is an abundant number, since it is smaller than the sum of its proper divisors (3396007464).

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

1781426136 is a wasteful number, since it uses less digits than its factorization.

1781426136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809 (or 805 counting only the distinct ones).

The product of its digits is 48384, while the sum is 39.

The square root of 1781426136 is about 42206.9441679921. The cubic root of 1781426136 is about 1212.2418506786.

The spelling of 1781426136 in words is "one billion, seven hundred eighty-one million, four hundred twenty-six thousand, one hundred thirty-six".