1378663 has 16 divisors (see below), whose sum is σ = 1677312. Its totient is φ = 1116000.

The previous prime is 1378639. The next prime is 1378669. The reversal of 1378663 is 3668731.

It is not a de Polignac number, because 1378663 - 2⁹ = 1378151 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1378669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4278 + ... + 4588.

It is an arithmetic number, because the mean of its divisors is an integer number (104832).

2^1378663 is an apocalyptic number.

1378663 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1378663 is a deficient number, since it is larger than the sum of its proper divisors (298649).

1378663 is a wasteful number, since it uses less digits than its factorization.

1378663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366.

The product of its digits is 18144, while the sum is 34.

The square root of 1378663 is about 1174.1648095561. The cubic root of 1378663 is about 111.2976616887.

The spelling of 1378663 in words is "one million, three hundred seventy-eight thousand, six hundred sixty-three".