1890449406 has 24 divisors (see below), whose sum is σ = 4096788384. Its totient is φ = 630024480.

The previous prime is 1890449401. The next prime is 1890449459. The reversal of 1890449406 is 6049440981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1890449401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 145530 + ... + 157986.

It is an arithmetic number, because the mean of its divisors is an integer number (170699516).

Almost surely, 2^1890449406 is an apocalyptic number.

1890449406 is an abundant number, since it is smaller than the sum of its proper divisors (2206338978).

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

1890449406 is a wasteful number, since it uses less digits than its factorization.

1890449406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20896 (or 20893 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 1890449406 is about 43479.2985913986. The cubic root of 1890449406 is about 1236.4835784907.

The spelling of 1890449406 in words is "one billion, eight hundred ninety million, four hundred forty-nine thousand, four hundred six".