74137421 has 2 divisors, whose sum is σ = 74137422. Its totient is φ = 74137420.

The previous prime is 74137417. The next prime is 74137423. The reversal of 74137421 is 12473147.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60668521 + 13468900 = 7789^2 + 3670^2 .

It is an emirp because it is prime and its reverse (12473147) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74137421 - 2² = 74137417 is a prime.

Together with 74137423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74137423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37068710 + 37068711.

It is an arithmetic number, because the mean of its divisors is an integer number (37068711).

Almost surely, 2^74137421 is an apocalyptic number.

It is an amenable number.

74137421 is a deficient number, since it is larger than the sum of its proper divisors (1).

74137421 is an equidigital number, since it uses as much as digits as its factorization.

74137421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4704, while the sum is 29.

The square root of 74137421 is about 8610.3089956168. The cubic root of 74137421 is about 420.0933673756.

The spelling of 74137421 in words is "seventy-four million, one hundred thirty-seven thousand, four hundred twenty-one".