1240729 has 6 divisors (see below), whose sum is σ = 1443354. Its totient is φ = 1063440.

The previous prime is 1240717. The next prime is 1240739. The reversal of 1240729 is 9270421.

It can be written as a sum of positive squares in only one way, i.e., 1177225 + 63504 = 1085^2 + 252^2 .

It is not a de Polignac number, because 1240729 - 2¹¹ = 1238681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1240709) 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, 12612 + ... + 12709.

It is an arithmetic number, because the mean of its divisors is an integer number (240559).

2^1240729 is an apocalyptic number.

It is an amenable number.

1240729 is a deficient number, since it is larger than the sum of its proper divisors (202625).

1240729 is an equidigital number, since it uses as much as digits as its factorization.

1240729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25335 (or 25328 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 1240729 is about 1113.8801551334. The cubic root of 1240729 is about 107.4547565154.

The spelling of 1240729 in words is "one million, two hundred forty thousand, seven hundred twenty-nine".