1393281 has 20 divisors (see below), whose sum is σ = 2114112. Its totient is φ = 914328.

The previous prime is 1393261. The next prime is 1393283. The reversal of 1393281 is 1823931.

It is not a de Polignac number, because 1393281 - 2¹¹ = 1391233 is a prime.

It is a super-2 number, since 2×1393281² = 3882463889922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1393283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 8260 + ... + 8426.

2^1393281 is an apocalyptic number.

It is an amenable number.

1393281 is a deficient number, since it is larger than the sum of its proper divisors (720831).

1393281 is a wasteful number, since it uses less digits than its factorization.

1393281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282 (or 273 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 1393281 is about 1180.3732460540. The cubic root of 1393281 is about 111.6896435479.

The spelling of 1393281 in words is "one million, three hundred ninety-three thousand, two hundred eighty-one".