840747730 has 8 divisors (see below), whose sum is σ = 1513345932. Its totient is φ = 336299088.

The previous prime is 840747679. The next prime is 840747749. The reversal of 840747730 is 37747048.

It can be written as a sum of positive squares in 2 ways, for example, as 805594689 + 35153041 = 28383^2 + 5929^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42037377 + ... + 42037396.

Almost surely, 2^840747730 is an apocalyptic number.

840747730 is a deficient number, since it is larger than the sum of its proper divisors (672598202).

840747730 is a wasteful number, since it uses less digits than its factorization.

840747730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84074780.

The product of its (nonzero) digits is 131712, while the sum is 40.

The square root of 840747730 is about 28995.6501910200. The cubic root of 840747730 is about 943.8186782177.

The spelling of 840747730 in words is "eight hundred forty million, seven hundred forty-seven thousand, seven hundred thirty".