8992421 has 2 divisors, whose sum is σ = 8992422. Its totient is φ = 8992420.

The previous prime is 8992411. The next prime is 8992441. The reversal of 8992421 is 1242998.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6477025 + 2515396 = 2545^2 + 1586^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8992421 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8992411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4496210 + 4496211.

It is an arithmetic number, because the mean of its divisors is an integer number (4496211).

Almost surely, 2^8992421 is an apocalyptic number.

It is an amenable number.

8992421 is a deficient number, since it is larger than the sum of its proper divisors (1).

8992421 is an equidigital number, since it uses as much as digits as its factorization.

8992421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 35.

The square root of 8992421 is about 2998.7365672896. The cubic root of 8992421 is about 207.9499771843.

The spelling of 8992421 in words is "eight million, nine hundred ninety-two thousand, four hundred twenty-one".