840021748 has 12 divisors (see below), whose sum is σ = 1556511012. Its totient is φ = 395304320.

The previous prime is 840021739. The next prime is 840021757. The reversal of 840021748 is 847120048.

840021748 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (840021739) and next prime (840021757).

It can be written as a sum of positive squares in 2 ways, for example, as 464747364 + 375274384 = 21558^2 + 19372^2 .

It is a super-2 number, since 2×840021748² = 1411273074225951008, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

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, 6176563 + ... + 6176698.

It is an arithmetic number, because the mean of its divisors is an integer number (129709251).

Almost surely, 2^840021748 is an apocalyptic number.

It is an amenable number.

840021748 is a deficient number, since it is larger than the sum of its proper divisors (716489264).

840021748 is a wasteful number, since it uses less digits than its factorization.

840021748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12353282 (or 12353280 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 34.

The square root of 840021748 is about 28983.1286785951. The cubic root of 840021748 is about 943.5469388826.

The spelling of 840021748 in words is "eight hundred forty million, twenty-one thousand, seven hundred forty-eight".