1388745 has 32 divisors (see below), whose sum is σ = 2519040. Its totient is φ = 734832.

The previous prime is 1388743. The next prime is 1388773. The reversal of 1388745 is 5478831.

It is not a de Polignac number, because 1388745 - 2¹ = 1388743 is a prime.

It is a super-2 number, since 2×1388745² = 3857225350050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1388743) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10872 + ... + 10998.

It is an arithmetic number, because the mean of its divisors is an integer number (78720).

2^1388745 is an apocalyptic number.

1388745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1388745 is a deficient number, since it is larger than the sum of its proper divisors (1130295).

1388745 is an frugal number, since it uses more digits than its factorization.

1388745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153 (or 135 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 1388745 is about 1178.4502535109. The cubic root of 1388745 is about 111.5683052554.

The spelling of 1388745 in words is "one million, three hundred eighty-eight thousand, seven hundred forty-five".