1242537 has 4 divisors (see below), whose sum is σ = 1656720. Its totient is φ = 828356.

The previous prime is 1242517. The next prime is 1242569. The reversal of 1242537 is 7352421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7352421 = 3 ⋅2450807.

It is a cyclic number.

It is not a de Polignac number, because 1242537 - 2¹⁸ = 980393 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (1242517) 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, 207087 + ... + 207092.

It is an arithmetic number, because the mean of its divisors is an integer number (414180).

2^1242537 is an apocalyptic number.

It is an amenable number.

1242537 is a deficient number, since it is larger than the sum of its proper divisors (414183).

1242537 is an equidigital number, since it uses as much as digits as its factorization.

1242537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414182.

The product of its digits is 1680, while the sum is 24.

The square root of 1242537 is about 1114.6914371251. The cubic root of 1242537 is about 107.5069258202.

Adding to 1242537 its reverse (7352421), we get a palindrome (8594958).

The spelling of 1242537 in words is "one million, two hundred forty-two thousand, five hundred thirty-seven".