1378764 has 18 divisors (see below), whose sum is σ = 3485300. Its totient is φ = 459576.

The previous prime is 1378763. The next prime is 1378777. The reversal of 1378764 is 4678731.

It is a tau number, because it is divible by the number of its divisors (18).

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

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 38299 = 1378764 / (1 + 3 + 7 + 8 + 7 + 6 + 4).

It is not an unprimeable number, because it can be changed into a prime (1378763) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19114 + ... + 19185.

2^1378764 is an apocalyptic number.

It is an amenable number.

1378764 is an abundant number, since it is smaller than the sum of its proper divisors (2106536).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1378764 is a wasteful number, since it uses less digits than its factorization.

1378764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38309 (or 38304 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 1378764 is about 1174.2078180629. The cubic root of 1378764 is about 111.3003794883.

The spelling of 1378764 in words is "one million, three hundred seventy-eight thousand, seven hundred sixty-four".