1142257 has 4 divisors (see below), whose sum is σ = 1179136. Its totient is φ = 1105380.

The previous prime is 1142243. The next prime is 1142263. The reversal of 1142257 is 7522411.

It is a happy number.

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: 7522411 = 13 ⋅578647.

It is a cyclic number.

It is not a de Polignac number, because 1142257 - 2⁷ = 1142129 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1142237) 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, 18393 + ... + 18454.

It is an arithmetic number, because the mean of its divisors is an integer number (294784).

2^1142257 is an apocalyptic number.

It is an amenable number.

1142257 is a deficient number, since it is larger than the sum of its proper divisors (36879).

1142257 is an equidigital number, since it uses as much as digits as its factorization.

1142257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36878.

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

The square root of 1142257 is about 1068.7642396712. The cubic root of 1142257 is about 104.5332876257.

Adding to 1142257 its reverse (7522411), we get a palindrome (8664668).

The spelling of 1142257 in words is "one million, one hundred forty-two thousand, two hundred fifty-seven".