1242397 has 4 divisors (see below), whose sum is σ = 1337980. Its totient is φ = 1146816.

The previous prime is 1242379. The next prime is 1242403. The reversal of 1242397 is 7932421.

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 63001 + 1179396 = 251^2 + 1086^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242397 - 2¹⁵ = 1209629 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242317) 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, 47772 + ... + 47797.

It is an arithmetic number, because the mean of its divisors is an integer number (334495).

2^1242397 is an apocalyptic number.

It is an amenable number.

1242397 is a deficient number, since it is larger than the sum of its proper divisors (95583).

1242397 is an equidigital number, since it uses as much as digits as its factorization.

1242397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95582.

The product of its digits is 3024, while the sum is 28.

The square root of 1242397 is about 1114.6286377085. The cubic root of 1242397 is about 107.5028879700.

Adding to 1242397 its product of digits (3024), we get a palindrome (1245421).

The spelling of 1242397 in words is "one million, two hundred forty-two thousand, three hundred ninety-seven".