1381500 has 72 divisors (see below), whose sum is σ = 4372368. Its totient is φ = 367200.

The previous prime is 1381493. The next prime is 1381507. The reversal of 1381500 is 51831.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1381493) and next prime (1381507).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381507) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4347 + ... + 4653.

2^1381500 is an apocalyptic number.

1381500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1381500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2186184).

1381500 is an abundant number, since it is smaller than the sum of its proper divisors (2990868).

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

1381500 is a wasteful number, since it uses less digits than its factorization.

1381500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332 (or 317 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 1381500 is about 1175.3722814496. The cubic root of 1381500 is about 111.3739518167.

It can be divided in two parts, 1381 and 500, that added together give a palindrome (1881).

The spelling of 1381500 in words is "one million, three hundred eighty-one thousand, five hundred".