1963861890 has 16 divisors (see below), whose sum is σ = 4713268608. Its totient is φ = 523696496.

The previous prime is 1963861859. The next prime is 1963861891. The reversal of 1963861890 is 981683691.

It is not an unprimeable number, because it can be changed into a prime (1963861891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32731002 + ... + 32731061.

It is an arithmetic number, because the mean of its divisors is an integer number (294579288).

Almost surely, 2^1963861890 is an apocalyptic number.

1963861890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1963861890 is an abundant number, since it is smaller than the sum of its proper divisors (2749406718).

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

1963861890 is a wasteful number, since it uses less digits than its factorization.

1963861890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65462073.

The product of its (nonzero) digits is 559872, while the sum is 51.

The square root of 1963861890 is about 44315.4813806643. The cubic root of 1963861890 is about 1252.2863520590.

The spelling of 1963861890 in words is "one billion, nine hundred sixty-three million, eight hundred sixty-one thousand, eight hundred ninety".