73709381 has 4 divisors (see below), whose sum is σ = 73910592. Its totient is φ = 73508172.

The previous prime is 73709347. The next prime is 73709429. The reversal of 73709381 is 18390737.

It is a happy number.

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: 18390737 = 367 ⋅50111.

It is a cyclic number.

It is not a de Polignac number, because 73709381 - 2¹⁰ = 73708357 is a prime.

It is a super-2 number, since 2×73709381² = 10866145694806322, 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 (73709681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100055 + ... + 100788.

It is an arithmetic number, because the mean of its divisors is an integer number (18477648).

Almost surely, 2^73709381 is an apocalyptic number.

It is an amenable number.

73709381 is a deficient number, since it is larger than the sum of its proper divisors (201211).

73709381 is a wasteful number, since it uses less digits than its factorization.

73709381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201210.

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 73709381 is about 8585.4167633261. The cubic root of 73709381 is about 419.2833223702.

The spelling of 73709381 in words is "seventy-three million, seven hundred nine thousand, three hundred eighty-one".