1890697194 has 64 divisors (see below), whose sum is σ = 4461868800. Its totient is φ = 591404544.

The previous prime is 1890697181. The next prime is 1890697199. The reversal of 1890697194 is 4917960981.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1890697194.

It is not an unprimeable number, because it can be changed into a prime (1890697199) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 326694 + ... + 332430.

It is an arithmetic number, because the mean of its divisors is an integer number (69716700).

Almost surely, 2^1890697194 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1890697194, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2230934400).

1890697194 is an abundant number, since it is smaller than the sum of its proper divisors (2571171606).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1890697194 is a wasteful number, since it uses less digits than its factorization.

1890697194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6124 (or 6118 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 54.

The square root of 1890697194 is about 43482.1479920208. The cubic root of 1890697194 is about 1236.5375995799.

The spelling of 1890697194 in words is "one billion, eight hundred ninety million, six hundred ninety-seven thousand, one hundred ninety-four".