1243825 has 12 divisors (see below), whose sum is σ = 1682928. Its totient is φ = 904400.

The previous prime is 1243819. The next prime is 1243841. The reversal of 1243825 is 5283421.

It is not a de Polignac number, because 1243825 - 2⁵ = 1243793 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1243825.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1987 + ... + 2536.

It is an arithmetic number, because the mean of its divisors is an integer number (140244).

2^1243825 is an apocalyptic number.

It is an amenable number.

1243825 is a deficient number, since it is larger than the sum of its proper divisors (439103).

1243825 is a wasteful number, since it uses less digits than its factorization.

1243825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4544 (or 4539 counting only the distinct ones).

The product of its digits is 1920, while the sum is 25.

The square root of 1243825 is about 1115.2690258409. The cubic root of 1243825 is about 107.5440598192.

The spelling of 1243825 in words is "one million, two hundred forty-three thousand, eight hundred twenty-five".