73743821 has 4 divisors (see below), whose sum is σ = 73966944. Its totient is φ = 73520700.

The previous prime is 73743811. The next prime is 73743827. The reversal of 73743821 is 12834737.

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 a de Polignac number, because none of the positive numbers 2^k-73743821 is a prime.

It is a super-2 number, since 2×73743821² = 10876302271360082, 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 (73743827) 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, 111065 + ... + 111726.

It is an arithmetic number, because the mean of its divisors is an integer number (18491736).

Almost surely, 2^73743821 is an apocalyptic number.

It is an amenable number.

73743821 is a deficient number, since it is larger than the sum of its proper divisors (223123).

73743821 is a wasteful number, since it uses less digits than its factorization.

73743821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223122.

The product of its digits is 28224, while the sum is 35.

The square root of 73743821 is about 8587.4222558344. The cubic root of 73743821 is about 419.3486142367.

The spelling of 73743821 in words is "seventy-three million, seven hundred forty-three thousand, eight hundred twenty-one".