73737421 has 2 divisors, whose sum is σ = 73737422. Its totient is φ = 73737420.

The previous prime is 73737397. The next prime is 73737427. The reversal of 73737421 is 12473737.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62252100 + 11485321 = 7890^2 + 3389^2 .

It is an emirp because it is prime and its reverse (12473737) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73737421 - 2⁹ = 73736909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73737427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36868710 + 36868711.

It is an arithmetic number, because the mean of its divisors is an integer number (36868711).

Almost surely, 2^73737421 is an apocalyptic number.

It is an amenable number.

73737421 is a deficient number, since it is larger than the sum of its proper divisors (1).

73737421 is an equidigital number, since it uses as much as digits as its factorization.

73737421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24696, while the sum is 34.

The square root of 73737421 is about 8587.0496097321. The cubic root of 73737421 is about 419.3364825592.

The spelling of 73737421 in words is "seventy-three million, seven hundred thirty-seven thousand, four hundred twenty-one".