1240687 has 6 divisors (see below), whose sum is σ = 1421304. Its totient is φ = 1060920.

The previous prime is 1240669. The next prime is 1240691. The reversal of 1240687 is 7860421.

It is not a de Polignac number, because 1240687 - 2⁷ = 1240559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240607) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2737 + ... + 3157.

It is an arithmetic number, because the mean of its divisors is an integer number (236884).

2^1240687 is an apocalyptic number.

1240687 is a deficient number, since it is larger than the sum of its proper divisors (180617).

1240687 is an frugal number, since it uses more digits than its factorization.

1240687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 849 (or 428 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 1240687 is about 1113.8613019582. The cubic root of 1240687 is about 107.4535440157.

Multiplying 1240687 by its sum of digits (28), we get a square (34739236 = 5894²).

The spelling of 1240687 in words is "one million, two hundred forty thousand, six hundred eighty-seven".