1242157 has 12 divisors (see below), whose sum is σ = 1477216. Its totient is φ = 1023120.

The previous prime is 1242151. The next prime is 1242167. The reversal of 1242157 is 7512421.

It is a happy number.

It is not a de Polignac number, because 1242157 - 2⁷ = 1242029 is a prime.

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

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 (1242151) 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 11 ways as a sum of consecutive naturals, for example, 5782 + ... + 5992.

2^1242157 is an apocalyptic number.

It is an amenable number.

1242157 is a deficient number, since it is larger than the sum of its proper divisors (235059).

1242157 is an equidigital number, since it uses as much as digits as its factorization.

1242157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276 (or 247 counting only the distinct ones).

The product of its digits is 560, while the sum is 22.

The square root of 1242157 is about 1114.5209733334. The cubic root of 1242157 is about 107.4959652353.

Adding to 1242157 its reverse (7512421), we get a palindrome (8754578).

The spelling of 1242157 in words is "one million, two hundred forty-two thousand, one hundred fifty-seven".