1378636 has 24 divisors (see below), whose sum is σ = 2812320. Its totient is φ = 579072.

The previous prime is 1378613. The next prime is 1378639. The reversal of 1378636 is 6368731.

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 7 ways as a sum of consecutive naturals, for example, 1020 + ... + 1948.

It is an arithmetic number, because the mean of its divisors is an integer number (117180).

2^1378636 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1378636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1406160).

1378636 is an abundant number, since it is smaller than the sum of its proper divisors (1433684).

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

1378636 is a wasteful number, since it uses less digits than its factorization.

1378636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 993 (or 991 counting only the distinct ones).

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

The square root of 1378636 is about 1174.1533119657. The cubic root of 1378636 is about 111.2969351257.

The spelling of 1378636 in words is "one million, three hundred seventy-eight thousand, six hundred thirty-six".