2190401 has 4 divisors (see below), whose sum is σ = 2195652. Its totient is φ = 2185152.

The previous prime is 2190389. The next prime is 2190403. The reversal of 2190401 is 1040912.

It is a happy number.

It is a Cunningham number, because it is equal to 1480²+1.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1893376 + 297025 = 1376^2 + 545^2 .

It is a cyclic number.

It is not a de Polignac number, because 2190401 - 2⁶ = 2190337 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2190401.

It is not an unprimeable number, because it can be changed into a prime (2190403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1940 + ... + 2853.

It is an arithmetic number, because the mean of its divisors is an integer number (548913).

2^2190401 is an apocalyptic number.

It is an amenable number.

2190401 is a deficient number, since it is larger than the sum of its proper divisors (5251).

2190401 is an equidigital number, since it uses as much as digits as its factorization.

2190401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5250.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 2190401 is about 1480.0003378378. Note that the first 3 decimals coincide. The cubic root of 2190401 is about 129.8697116754.

The spelling of 2190401 in words is "two million, one hundred ninety thousand, four hundred one".