1252731 has 4 divisors (see below), whose sum is σ = 1670312. Its totient is φ = 835152.

The previous prime is 1252729. The next prime is 1252739. The reversal of 1252731 is 1372521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1372521 = 3 ⋅457507.

It is not a de Polignac number, because 1252731 - 2¹ = 1252729 is a prime.

It is a super-2 number, since 2×1252731² = 3138669916722, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1252698 and 1252707.

It is not an unprimeable number, because it can be changed into a prime (1252739) 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, 208786 + ... + 208791.

It is an arithmetic number, because the mean of its divisors is an integer number (417578).

2^1252731 is an apocalyptic number.

1252731 is a deficient number, since it is larger than the sum of its proper divisors (417581).

1252731 is an equidigital number, since it uses as much as digits as its factorization.

1252731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417580.

The product of its digits is 420, while the sum is 21.

The square root of 1252731 is about 1119.2546627109. The cubic root of 1252731 is about 107.8001275867.

The spelling of 1252731 in words is "one million, two hundred fifty-two thousand, seven hundred thirty-one".