2161740 has 48 divisors (see below), whose sum is σ = 6918912. Its totient is φ = 494016.

The previous prime is 2161729. The next prime is 2161751. The reversal of 2161740 is 471612.

It is an interprime number because it is at equal distance from previous prime (2161729) and next prime (2161751).

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

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, 2154 + ... + 2993.

It is an arithmetic number, because the mean of its divisors is an integer number (144144).

2^2161740 is an apocalyptic number.

2161740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2161740 is an abundant number, since it is smaller than the sum of its proper divisors (4757172).

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

2161740 is a wasteful number, since it uses less digits than its factorization.

2161740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5166 (or 5164 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 2161740 is about 1470.2856865249. The cubic root of 2161740 is about 129.3007824224.

The spelling of 2161740 in words is "two million, one hundred sixty-one thousand, seven hundred forty".