74000921 has 2 divisors, whose sum is σ = 74000922. Its totient is φ = 74000920.

The previous prime is 74000917. The next prime is 74000929. The reversal of 74000921 is 12900047.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45751696 + 28249225 = 6764^2 + 5315^2 .

It is an emirp because it is prime and its reverse (12900047) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74000921 - 2² = 74000917 is a prime.

It is a super-2 number, since 2×74000921² = 10952272617696482, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (74000929) 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, 37000460 + 37000461.

It is an arithmetic number, because the mean of its divisors is an integer number (37000461).

Almost surely, 2^74000921 is an apocalyptic number.

It is an amenable number.

74000921 is a deficient number, since it is larger than the sum of its proper divisors (1).

74000921 is an equidigital number, since it uses as much as digits as its factorization.

74000921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 74000921 is about 8602.3787989137. The cubic root of 74000921 is about 419.8353871159.

Adding to 74000921 its reverse (12900047), we get a palindrome (86900968).

The spelling of 74000921 in words is "seventy-four million, nine hundred twenty-one", and thus it is an aban number.