1240251 has 4 divisors (see below), whose sum is σ = 1653672. Its totient is φ = 826832.

The previous prime is 1240247. The next prime is 1240271. The reversal of 1240251 is 1520421.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1240251 - 2² = 1240247 is a prime.

It is a D-number.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 1240251.

It is not an unprimeable number, because it can be changed into a prime (1240231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206706 + ... + 206711.

It is an arithmetic number, because the mean of its divisors is an integer number (413418).

2^1240251 is an apocalyptic number.

1240251 is a deficient number, since it is larger than the sum of its proper divisors (413421).

1240251 is an equidigital number, since it uses as much as digits as its factorization.

1240251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413420.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 1240251 is about 1113.6655691903. The cubic root of 1240251 is about 107.4409554971.

Adding to 1240251 its reverse (1520421), we get a palindrome (2760672).

The spelling of 1240251 in words is "one million, two hundred forty thousand, two hundred fifty-one".