1890965 has 4 divisors (see below), whose sum is σ = 2269164. Its totient is φ = 1512768.

The previous prime is 1890953. The next prime is 1890997. The reversal of 1890965 is 5690981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5690981 = 53 ⋅107377.

It can be written as a sum of positive squares in 2 ways, for example, as 237169 + 1653796 = 487^2 + 1286^2 .

It is a cyclic number.

It is not a de Polignac number, because 1890965 - 2⁶ = 1890901 is a prime.

It is a super-3 number, since 3×1890965³ = 20284846531333146375, which contains 333 as substring.

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

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189092 + ... + 189101.

It is an arithmetic number, because the mean of its divisors is an integer number (567291).

2^1890965 is an apocalyptic number.

It is an amenable number.

1890965 is a deficient number, since it is larger than the sum of its proper divisors (378199).

1890965 is an equidigital number, since it uses as much as digits as its factorization.

1890965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378198.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 1890965 is about 1375.1236308056. The cubic root of 1890965 is about 123.6595979553.

The spelling of 1890965 in words is "one million, eight hundred ninety thousand, nine hundred sixty-five".