9921437 has 4 divisors (see below), whose sum is σ = 9930336. Its totient is φ = 9912540.

The previous prime is 9921409. The next prime is 9921449. The reversal of 9921437 is 7341299.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 9921437 - 2¹⁴ = 9905053 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9921397 and 9921406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9921407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2489 + ... + 5102.

It is an arithmetic number, because the mean of its divisors is an integer number (2482584).

Almost surely, 2^9921437 is an apocalyptic number.

It is an amenable number.

9921437 is a deficient number, since it is larger than the sum of its proper divisors (8899).

9921437 is a wasteful number, since it uses less digits than its factorization.

9921437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8898.

The product of its digits is 13608, while the sum is 35.

The square root of 9921437 is about 3149.8312653220. The cubic root of 9921437 is about 214.8777888472.

The spelling of 9921437 in words is "nine million, nine hundred twenty-one thousand, four hundred thirty-seven".