1380646 has 4 divisors (see below), whose sum is σ = 2070972. Its totient is φ = 690322.

The previous prime is 1380637. The next prime is 1380653. The reversal of 1380646 is 6460831.

It is a semiprime because it is the product of two primes.

It is a nialpdrome in base 11.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345160 + ... + 345163.

It is an arithmetic number, because the mean of its divisors is an integer number (517743).

2^1380646 is an apocalyptic number.

1380646 is a deficient number, since it is larger than the sum of its proper divisors (690326).

1380646 is an equidigital number, since it uses as much as digits as its factorization.

1380646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690325.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 1380646 is about 1175.0089361362. The cubic root of 1380646 is about 111.3509977908.

The spelling of 1380646 in words is "one million, three hundred eighty thousand, six hundred forty-six".