1240781 has 8 divisors (see below), whose sum is σ = 1314240. Its totient is φ = 1168992.

The previous prime is 1240777. The next prime is 1240793. The reversal of 1240781 is 1870421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1240781 - 2² = 1240777 is a prime.

It is a super-2 number, since 2×1240781² = 3079074979922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1310 + ... + 2048.

It is an arithmetic number, because the mean of its divisors is an integer number (164280).

2^1240781 is an apocalyptic number.

It is an amenable number.

1240781 is a deficient number, since it is larger than the sum of its proper divisors (73459).

1240781 is an equidigital number, since it uses as much as digits as its factorization.

1240781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 835.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 1240781 is about 1113.9034967177. The cubic root of 1240781 is about 107.4562576676.

The spelling of 1240781 in words is "one million, two hundred forty thousand, seven hundred eighty-one".