1964889138 has 16 divisors (see below), whose sum is σ = 4160941920. Its totient is φ = 616435776.

The previous prime is 1964889109. The next prime is 1964889139. The reversal of 1964889138 is 8319884691.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1964889139) 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, 9631708 + ... + 9631911.

It is an arithmetic number, because the mean of its divisors is an integer number (260058870).

Almost surely, 2^1964889138 is an apocalyptic number.

1964889138 is an abundant number, since it is smaller than the sum of its proper divisors (2196052782).

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

1964889138 is a wasteful number, since it uses less digits than its factorization.

1964889138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19263641.

The product of its digits is 2985984, while the sum is 57.

The square root of 1964889138 is about 44327.0700362656. The cubic root of 1964889138 is about 1252.5046607609.

The spelling of 1964889138 in words is "one billion, nine hundred sixty-four million, eight hundred eighty-nine thousand, one hundred thirty-eight".