9731421 has 28 divisors (see below), whose sum is σ = 16683552. Its totient is φ = 5557896.

The previous prime is 9731419. The next prime is 9731437. The reversal of 9731421 is 1241379.

It is not a de Polignac number, because 9731421 - 2¹ = 9731419 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9731441) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 4150 + ... + 6056.

Almost surely, 2^9731421 is an apocalyptic number.

It is an amenable number.

9731421 is a deficient number, since it is larger than the sum of its proper divisors (6952131).

9731421 is an equidigital number, since it uses as much as digits as its factorization.

9731421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1932 (or 1917 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 9731421 is about 3119.5225596235. The cubic root of 9731421 is about 213.4971525452.

The spelling of 9731421 in words is "nine million, seven hundred thirty-one thousand, four hundred twenty-one".