9721001438 has 8 divisors (see below), whose sum is σ = 15439237632. Its totient is φ = 4574588896.

The previous prime is 9721001401. The next prime is 9721001447. The reversal of 9721001438 is 8341001279.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 9721001398 and 9721001407.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142955870 + ... + 142955937.

It is an arithmetic number, because the mean of its divisors is an integer number (1929904704).

Almost surely, 2^9721001438 is an apocalyptic number.

9721001438 is a deficient number, since it is larger than the sum of its proper divisors (5718236194).

9721001438 is a wasteful number, since it uses less digits than its factorization.

9721001438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285911826.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 9721001438 is about 98595.1390181078. The cubic root of 9721001438 is about 2134.2092725252.

The spelling of 9721001438 in words is "nine billion, seven hundred twenty-one million, one thousand, four hundred thirty-eight".