840821725 has 12 divisors (see below), whose sum is σ = 1097494240. Its totient is φ = 637254000.

The previous prime is 840821701. The next prime is 840821747. The reversal of 840821725 is 527128048.

It is not a de Polignac number, because 840821725 - 2¹⁵ = 840788957 is a prime.

It is a super-3 number, since 3×840821725³ (a number of 28 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 884601 + ... + 885550.

Almost surely, 2^840821725 is an apocalyptic number.

It is an amenable number.

840821725 is a deficient number, since it is larger than the sum of its proper divisors (256672515).

840821725 is a wasteful number, since it uses less digits than its factorization.

840821725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1770180 (or 1770175 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 37.

The square root of 840821725 is about 28996.9261301952. The cubic root of 840821725 is about 943.8463661959.

The spelling of 840821725 in words is "eight hundred forty million, eight hundred twenty-one thousand, seven hundred twenty-five".