1890950645 has 4 divisors (see below), whose sum is σ = 2269140780. Its totient is φ = 1512760512.

The previous prime is 1890950629. The next prime is 1890950653. The reversal of 1890950645 is 5460590981.

It is a happy number.

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 310570129 + 1580380516 = 17623^2 + 39754^2 .

It is a cyclic number.

It is not a de Polignac number, because 1890950645 - 2⁴ = 1890950629 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1890950645.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189095060 + ... + 189095069.

It is an arithmetic number, because the mean of its divisors is an integer number (567285195).

Almost surely, 2^1890950645 is an apocalyptic number.

It is an amenable number.

1890950645 is a deficient number, since it is larger than the sum of its proper divisors (378190135).

1890950645 is an equidigital number, since it uses as much as digits as its factorization.

1890950645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378190134.

The product of its (nonzero) digits is 388800, while the sum is 47.

The square root of 1890950645 is about 43485.0623202957. The cubic root of 1890950645 is about 1236.5928503958.

The spelling of 1890950645 in words is "one billion, eight hundred ninety million, nine hundred fifty thousand, six hundred forty-five".