9921964340 has 24 divisors (see below), whose sum is σ = 21147114912. Its totient is φ = 3909549600.

The previous prime is 9921964307. The next prime is 9921964357. The reversal of 9921964340 is 434691299.

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 an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3700886 + ... + 3703565.

It is an arithmetic number, because the mean of its divisors is an integer number (881129788).

Almost surely, 2^9921964340 is an apocalyptic number.

It is an amenable number.

9921964340 is an abundant number, since it is smaller than the sum of its proper divisors (11225150572).

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

9921964340 is a wasteful number, since it uses less digits than its factorization.

9921964340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7404527 (or 7404525 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 47.

The square root of 9921964340 is about 99609.0575198862. The cubic root of 9921964340 is about 2148.8159581070.

The spelling of 9921964340 in words is "nine billion, nine hundred twenty-one million, nine hundred sixty-four thousand, three hundred forty".