1378638 has 24 divisors (see below), whose sum is σ = 3010176. Its totient is φ = 456000.

The previous prime is 1378613. The next prime is 1378639. The reversal of 1378638 is 8368731.

1378638 is a `hidden beast` number, since 13 + 7 + 8 + 638 = 666.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1378639) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3238 + ... + 3638.

It is an arithmetic number, because the mean of its divisors is an integer number (125424).

2^1378638 is an apocalyptic number.

1378638 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1378638 is an abundant number, since it is smaller than the sum of its proper divisors (1631538).

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

1378638 is a wasteful number, since it uses less digits than its factorization.

1378638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600 (or 597 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 1378638 is about 1174.1541636429. The cubic root of 1378638 is about 111.2969889456.

It can be divided in two parts, 13786 and 38, that added together give a cube (13824 = 24³).

The spelling of 1378638 in words is "one million, three hundred seventy-eight thousand, six hundred thirty-eight".