1395217844 has 12 divisors (see below), whose sum is σ = 2454283524. Its totient is φ = 693993984.

The previous prime is 1395217819. The next prime is 1395217853. The reversal of 1395217844 is 4487125931.

It can be written as a sum of positive squares in 2 ways, for example, as 563587600 + 831630244 = 23740^2 + 28838^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1395217795 and 1395217804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 902867 + ... + 904410.

It is an arithmetic number, because the mean of its divisors is an integer number (204523627).

Almost surely, 2^1395217844 is an apocalyptic number.

It is an amenable number.

1395217844 is a deficient number, since it is larger than the sum of its proper divisors (1059065680).

1395217844 is a wasteful number, since it uses less digits than its factorization.

1395217844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1807474 (or 1807472 counting only the distinct ones).

The product of its digits is 241920, while the sum is 44.

The square root of 1395217844 is about 37352.6149553147. The cubic root of 1395217844 is about 1117.4137402034.

The spelling of 1395217844 in words is "one billion, three hundred ninety-five million, two hundred seventeen thousand, eight hundred forty-four".