1387264 has 18 divisors (see below), whose sum is σ = 2769620. Its totient is φ = 693504.

The previous prime is 1387261. The next prime is 1387271. The reversal of 1387264 is 4627831.

It is not an unprimeable number, because it can be changed into a prime (1387261) 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 as a sum of consecutive naturals, namely, 2454 + ... + 2965.

2^1387264 is an apocalyptic number.

It is an amenable number.

1387264 is a deficient number, since it is larger than the sum of its proper divisors (1382356).

1387264 is an frugal number, since it uses more digits than its factorization.

1387264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5435 (or 5421 counting only the distinct ones).

The product of its digits is 8064, while the sum is 31.

The square root of 1387264 is about 1177.8217182579. The cubic root of 1387264 is about 111.5286312017.

The spelling of 1387264 in words is "one million, three hundred eighty-seven thousand, two hundred sixty-four".