1890936640 has 56 divisors (see below), whose sum is σ = 4513295520. Its totient is φ = 754610688.

The previous prime is 1890936637. The next prime is 1890936659. The reversal of 1890936640 is 466390981.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135091 + ... + 148429.

Almost surely, 2^1890936640 is an apocalyptic number.

1890936640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1890936640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2256647760).

1890936640 is an abundant number, since it is smaller than the sum of its proper divisors (2622358880).

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

1890936640 is a wasteful number, since it uses less digits than its factorization.

1890936640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13799 (or 13789 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 1890936640 is about 43484.9012876884. The cubic root of 1890936640 is about 1236.5897975177.

The spelling of 1890936640 in words is "one billion, eight hundred ninety million, nine hundred thirty-six thousand, six hundred forty".