1240397 has 4 divisors (see below), whose sum is σ = 1242780. Its totient is φ = 1238016.

The previous prime is 1240391. The next prime is 1240399. The reversal of 1240397 is 7930421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 630436 + 609961 = 794^2 + 781^2 .

It is a cyclic number.

It is not a de Polignac number, because 1240397 - 2⁶ = 1240333 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 (1240391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38 + ... + 1575.

It is an arithmetic number, because the mean of its divisors is an integer number (310695).

2^1240397 is an apocalyptic number.

It is an amenable number.

1240397 is a deficient number, since it is larger than the sum of its proper divisors (2383).

1240397 is an equidigital number, since it uses as much as digits as its factorization.

1240397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2382.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 1240397 is about 1113.7311165627. The cubic root of 1240397 is about 107.4451712470.

The spelling of 1240397 in words is "one million, two hundred forty thousand, three hundred ninety-seven".