1215825 has 48 divisors (see below), whose sum is σ = 2291520. Its totient is φ = 564480.

The previous prime is 1215787. The next prime is 1215827. The reversal of 1215825 is 5285121.

It is not a de Polignac number, because 1215825 - 2⁸ = 1215569 is a prime.

1215825 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1215795 and 1215804.

It is not an unprimeable number, because it can be changed into a prime (1215827) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 28254 + ... + 28296.

It is an arithmetic number, because the mean of its divisors is an integer number (47740).

2^1215825 is an apocalyptic number.

1215825 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1215825 is a deficient number, since it is larger than the sum of its proper divisors (1075695).

1215825 is a wasteful number, since it uses less digits than its factorization.

1215825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98 (or 93 counting only the distinct ones).

The product of its digits is 800, while the sum is 24.

The square root of 1215825 is about 1102.6445483473. The cubic root of 1215825 is about 106.7309454150.

The spelling of 1215825 in words is "one million, two hundred fifteen thousand, eight hundred twenty-five".