840747458 has 4 divisors (see below), whose sum is σ = 1261121190. Its totient is φ = 420373728.

The previous prime is 840747443. The next prime is 840747499. The reversal of 840747458 is 854747048.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 471454369 + 369293089 = 21713^2 + 19217^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210186863 + ... + 210186866.

Almost surely, 2^840747458 is an apocalyptic number.

840747458 is a deficient number, since it is larger than the sum of its proper divisors (420373732).

840747458 is a wasteful number, since it uses less digits than its factorization.

840747458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420373731.

The product of its (nonzero) digits is 1003520, while the sum is 47.

The square root of 840747458 is about 28995.6455006610. The cubic root of 840747458 is about 943.8185764358.

The spelling of 840747458 in words is "eight hundred forty million, seven hundred forty-seven thousand, four hundred fifty-eight".