1890901 has 2 divisors, whose sum is σ = 1890902. Its totient is φ = 1890900.

The previous prime is 1890877. The next prime is 1890913. The reversal of 1890901 is 1090981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1887876 + 3025 = 1374^2 + 55^2 .

It is a cyclic number.

It is not a de Polignac number, because 1890901 - 2⁵ = 1890869 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 1890901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1890401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 945450 + 945451.

It is an arithmetic number, because the mean of its divisors is an integer number (945451).

2^1890901 is an apocalyptic number.

It is an amenable number.

1890901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1890901 is an equidigital number, since it uses as much as digits as its factorization.

1890901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 1890901 is about 1375.1003599738. The cubic root of 1890901 is about 123.6582028469.

The spelling of 1890901 in words is "one million, eight hundred ninety thousand, nine hundred one".