73891421 has 4 divisors (see below), whose sum is σ = 74040000. Its totient is φ = 73742844.

The previous prime is 73891417. The next prime is 73891439. The reversal of 73891421 is 12419837.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 73891421 - 2² = 73891417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73891121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73541 + ... + 74538.

It is an arithmetic number, because the mean of its divisors is an integer number (18510000).

Almost surely, 2^73891421 is an apocalyptic number.

It is an amenable number.

73891421 is a deficient number, since it is larger than the sum of its proper divisors (148579).

73891421 is a wasteful number, since it uses less digits than its factorization.

73891421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148578.

The product of its digits is 12096, while the sum is 35.

The square root of 73891421 is about 8596.0119241425. The cubic root of 73891421 is about 419.6282065024.

The spelling of 73891421 in words is "seventy-three million, eight hundred ninety-one thousand, four hundred twenty-one".