1963964540 has 24 divisors (see below), whose sum is σ = 4191940032. Its totient is φ = 772706880.

The previous prime is 1963964539. The next prime is 1963964543. The reversal of 1963964540 is 454693691.

It is a happy number.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1963964543) 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, 803684 + ... + 806123.

It is an arithmetic number, because the mean of its divisors is an integer number (174664168).

Almost surely, 2^1963964540 is an apocalyptic number.

1963964540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1963964540 is an abundant number, since it is smaller than the sum of its proper divisors (2227975492).

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

1963964540 is a wasteful number, since it uses less digits than its factorization.

1963964540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1609877 (or 1609875 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 47.

The square root of 1963964540 is about 44316.6395386654. The cubic root of 1963964540 is about 1252.3081704559.

The spelling of 1963964540 in words is "one billion, nine hundred sixty-three million, nine hundred sixty-four thousand, five hundred forty".