1375640 has 64 divisors (see below), whose sum is σ = 3758400. Its totient is φ = 443904.

The previous prime is 1375639. The next prime is 1375669. The reversal of 1375640 is 465731.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80912 + ... + 80928.

It is an arithmetic number, because the mean of its divisors is an integer number (58725).

2^1375640 is an apocalyptic number.

1375640 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 1375640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1879200).

1375640 is an abundant number, since it is smaller than the sum of its proper divisors (2382760).

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

1375640 is an equidigital number, since it uses as much as digits as its factorization.

1375640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69 (or 31 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 1375640 is about 1172.8768051249. The cubic root of 1375640 is about 111.2162545464.

Subtracting from 1375640 its reverse (465731), we obtain a palindrome (909909).

The spelling of 1375640 in words is "one million, three hundred seventy-five thousand, six hundred forty".