1242637 has 4 divisors (see below), whose sum is σ = 1355616. Its totient is φ = 1129660.

The previous prime is 1242629. The next prime is 1242641. The reversal of 1242637 is 7362421.

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: 7362421 = 11 ⋅669311.

It is a cyclic number.

It is not a de Polignac number, because 1242637 - 2³ = 1242629 is a prime.

It is a Duffinian number.

1242637 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56473 + ... + 56494.

It is an arithmetic number, because the mean of its divisors is an integer number (338904).

2^1242637 is an apocalyptic number.

It is an amenable number.

1242637 is a deficient number, since it is larger than the sum of its proper divisors (112979).

1242637 is a wasteful number, since it uses less digits than its factorization.

1242637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112978.

The product of its digits is 2016, while the sum is 25.

The square root of 1242637 is about 1114.7362916852. The cubic root of 1242637 is about 107.5098098133.

The spelling of 1242637 in words is "one million, two hundred forty-two thousand, six hundred thirty-seven".