1890161 has 8 divisors (see below), whose sum is σ = 2326464. Its totient is φ = 1495440.

The previous prime is 1890149. The next prime is 1890167. The reversal of 1890161 is 1610981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1890161 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 1890161.

It is not an unprimeable number, because it can be changed into a prime (1890167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10295 + ... + 10476.

It is an arithmetic number, because the mean of its divisors is an integer number (290808).

2^1890161 is an apocalyptic number.

It is an amenable number.

1890161 is a deficient number, since it is larger than the sum of its proper divisors (436303).

1890161 is a wasteful number, since it uses less digits than its factorization.

1890161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20791.

The product of its (nonzero) digits is 432, while the sum is 26.

The square root of 1890161 is about 1374.8312623737. The cubic root of 1890161 is about 123.6420696191.

The spelling of 1890161 in words is "one million, eight hundred ninety thousand, one hundred sixty-one".