1380643 has 8 divisors (see below), whose sum is σ = 1514736. Its totient is φ = 1248000.

The previous prime is 1380637. The next prime is 1380653. The reversal of 1380643 is 3460831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1380643 - 2⁵ = 1380611 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (1380623) 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, 3243 + ... + 3643.

It is an arithmetic number, because the mean of its divisors is an integer number (189342).

2^1380643 is an apocalyptic number.

1380643 is a deficient number, since it is larger than the sum of its proper divisors (134093).

1380643 is a wasteful number, since it uses less digits than its factorization.

1380643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 1380643 is about 1175.0076595495. The cubic root of 1380643 is about 111.3509171393.

It can be divided in two parts, 13 and 80643, that added together give a square (80656 = 284²).

The spelling of 1380643 in words is "one million, three hundred eighty thousand, six hundred forty-three".