1380645 has 40 divisors (see below), whose sum is σ = 2834304. Its totient is φ = 629856.

The previous prime is 1380637. The next prime is 1380653. The reversal of 1380645 is 5460831.

1380645 is a `hidden beast` number, since 13 + 8 + 0 + 645 = 666.

It is an interprime number because it is at equal distance from previous prime (1380637) and next prime (1380653).

It is not a de Polignac number, because 1380645 - 2³ = 1380637 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 in 39 ways as a sum of consecutive naturals, for example, 2592 + ... + 3078.

2^1380645 is an apocalyptic number.

1380645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1380645 is an abundant number, since it is smaller than the sum of its proper divisors (1453659).

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

1380645 is an equidigital number, since it uses as much as digits as its factorization.

1380645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511 (or 502 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 1380645 is about 1175.0085106075. The cubic root of 1380645 is about 111.3509709070.

It can be divided in two parts, 1380 and 645, that added together give a square (2025 = 45²).

The spelling of 1380645 in words is "one million, three hundred eighty thousand, six hundred forty-five".