1781488342 has 4 divisors (see below), whose sum is σ = 2672232516. Its totient is φ = 890744170.

The previous prime is 1781488333. The next prime is 1781488343. The reversal of 1781488342 is 2438841871.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2438841871 = 83 ⋅29383637.

It is a junction number, because it is equal to n+sod(n) for n = 1781488292 and 1781488301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1781488343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445372084 + ... + 445372087.

It is an arithmetic number, because the mean of its divisors is an integer number (668058129).

Almost surely, 2^1781488342 is an apocalyptic number.

1781488342 is a deficient number, since it is larger than the sum of its proper divisors (890744174).

1781488342 is an equidigital number, since it uses as much as digits as its factorization.

1781488342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890744173.

The product of its digits is 344064, while the sum is 46.

The square root of 1781488342 is about 42207.6810782113. The cubic root of 1781488342 is about 1212.2559606918.

The spelling of 1781488342 in words is "one billion, seven hundred eighty-one million, four hundred eighty-eight thousand, three hundred forty-two".