1236840 has 64 divisors (see below), whose sum is σ = 4052160. Its totient is φ = 299520.

The previous prime is 1236827. The next prime is 1236857. The reversal of 1236840 is 486321.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1236840.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 852 + ... + 1788.

It is an arithmetic number, because the mean of its divisors is an integer number (63315).

2^1236840 is an apocalyptic number.

1236840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1236840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2026080).

1236840 is an abundant number, since it is smaller than the sum of its proper divisors (2815320).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1236840 is a wasteful number, since it uses less digits than its factorization.

1236840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 962 (or 958 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 1236840 is about 1112.1330855613. The cubic root of 1236840 is about 107.3423685753.

The spelling of 1236840 in words is "one million, two hundred thirty-six thousand, eight hundred forty".