1645140 has 48 divisors (see below), whose sum is σ = 5265792. Its totient is φ = 375936.

The previous prime is 1645129. The next prime is 1645151. The reversal of 1645140 is 415461.

It is an interprime number because it is at equal distance from previous prime (1645129) and next prime (1645151).

It is a Harshad number since it is a multiple of its sum of digits (21).

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, 1539 + ... + 2378.

It is an arithmetic number, because the mean of its divisors is an integer number (109704).

2^1645140 is an apocalyptic number.

1645140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1645140 is an abundant number, since it is smaller than the sum of its proper divisors (3620652).

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

1645140 is a wasteful number, since it uses less digits than its factorization.

1645140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3936 (or 3934 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1645140 is about 1282.6301103592. The cubic root of 1645140 is about 118.0504428595.

The spelling of 1645140 in words is "one million, six hundred forty-five thousand, one hundred forty".