1382640 has 80 divisors (see below), whose sum is σ = 4904448. Its totient is φ = 315648.

The previous prime is 1382629. The next prime is 1382651. The reversal of 1382640 is 462831.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1382629) and next prime (1382651).

It is a tau number, because it is divible by the number of its divisors (80).

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 1382640.

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, 1269 + ... + 2091.

2^1382640 is an apocalyptic number.

1382640 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 1382640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2452224).

1382640 is an abundant number, since it is smaller than the sum of its proper divisors (3521808).

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

1382640 is a wasteful number, since it uses less digits than its factorization.

1382640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 846 (or 840 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 1382640 is about 1175.8571341791. The cubic root of 1382640 is about 111.4045782848.

The spelling of 1382640 in words is "one million, three hundred eighty-two thousand, six hundred forty".