1381864 has 32 divisors (see below), whose sum is σ = 2903040. Its totient is φ = 611200.

The previous prime is 1381859. The next prime is 1381871. The reversal of 1381864 is 4681831.

It is a super-2 number, since 2×1381864² = 3819096228992, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3417 + ... + 3799.

It is an arithmetic number, because the mean of its divisors is an integer number (90720).

2^1381864 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 1381864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1451520).

1381864 is an abundant number, since it is smaller than the sum of its proper divisors (1521176).

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

1381864 is a wasteful number, since it uses less digits than its factorization.

1381864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441 (or 437 counting only the distinct ones).

The product of its digits is 4608, while the sum is 31.

The square root of 1381864 is about 1175.5271158081. The cubic root of 1381864 is about 111.3837326246.

It can be divided in two parts, 138 and 1864, that added together give a palindrome (2002).

The spelling of 1381864 in words is "one million, three hundred eighty-one thousand, eight hundred sixty-four".