1371645 has 48 divisors (see below), whose sum is σ = 2763072. Its totient is φ = 622080.

The previous prime is 1371641. The next prime is 1371647. The reversal of 1371645 is 5461731.

1371645 is a `hidden beast` number, since 13 + 7 + 1 + 645 = 666.

It is not a de Polignac number, because 1371645 - 2² = 1371641 is a prime.

1371645 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1371641) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8334 + ... + 8496.

It is an arithmetic number, because the mean of its divisors is an integer number (57564).

2^1371645 is an apocalyptic number.

1371645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1371645 is an abundant number, since it is smaller than the sum of its proper divisors (1391427).

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

1371645 is a wasteful number, since it uses less digits than its factorization.

1371645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202 (or 199 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 1371645 is about 1171.1724894310. The cubic root of 1371645 is about 111.1084890122.

It can be divided in two parts, 1371 and 645, that added together give a triangular number (2016 = T₆₃).

The spelling of 1371645 in words is "one million, three hundred seventy-one thousand, six hundred forty-five".