840537 has 14 divisors (see below), whose sum is σ = 1261322. Its totient is φ = 559872.

The previous prime is 840523. The next prime is 840547. The reversal of 840537 is 735048.

It can be written as a sum of positive squares in only one way, i.e., 793881 + 46656 = 891^2 + 216^2 .

It is not a de Polignac number, because 840537 - 2⁶ = 840473 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 840537.

It is not an unprimeable number, because it can be changed into a prime (840547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 153 + ... + 1305.

2⁸⁴⁰⁵³⁷ is an apocalyptic number.

It is an amenable number.

840537 is a deficient number, since it is larger than the sum of its proper divisors (420785).

840537 is an equidigital number, since it uses as much as digits as its factorization.

840537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1171 (or 1156 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 840537 is about 916.8080497029. The cubic root of 840537 is about 94.3739816857.

The spelling of 840537 in words is "eight hundred forty thousand, five hundred thirty-seven".