73966381 has 4 divisors (see below), whose sum is σ = 74133792. Its totient is φ = 73798972.

The previous prime is 73966379. The next prime is 73966397. The reversal of 73966381 is 18366937.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18366937 = 1429 ⋅12853.

It is a cyclic number.

It is not a de Polignac number, because 73966381 - 2¹ = 73966379 is a prime.

It is a super-2 number, since 2×73966381² = 10942051036474322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73966351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83041 + ... + 83926.

It is an arithmetic number, because the mean of its divisors is an integer number (18533448).

Almost surely, 2^73966381 is an apocalyptic number.

It is an amenable number.

73966381 is a deficient number, since it is larger than the sum of its proper divisors (167411).

73966381 is a wasteful number, since it uses less digits than its factorization.

73966381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167410.

The product of its digits is 163296, while the sum is 43.

The square root of 73966381 is about 8600.3709803706. The cubic root of 73966381 is about 419.7700574290.

It can be divided in two parts, 73966 and 381, that added together give a palindrome (74347).

The spelling of 73966381 in words is "seventy-three million, nine hundred sixty-six thousand, three hundred eighty-one".