1371840 has 56 divisors (see below), whose sum is σ = 4358640. Its totient is φ = 365568.

The previous prime is 1371827. The next prime is 1371841. The reversal of 1371840 is 481731.

1371840 is nontrivially palindromic in base 11.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1371840.

It is not an unprimeable number, because it can be changed into a prime (1371841) 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, 246 + ... + 1674.

2^1371840 is an apocalyptic number.

1371840 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 1371840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2179320).

1371840 is an abundant number, since it is smaller than the sum of its proper divisors (2986800).

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

1371840 is a wasteful number, since it uses less digits than its factorization.

1371840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1449 (or 1439 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 1371840 is about 1171.2557363787. The cubic root of 1371840 is about 111.1137540112.

It can be divided in two parts, 1371 and 840, that added together give a triangular number (2211 = T₆₆).

The spelling of 1371840 in words is "one million, three hundred seventy-one thousand, eight hundred forty".