73740021 has 8 divisors (see below), whose sum is σ = 98368800. Its totient is φ = 49135632.

The previous prime is 73739993. The next prime is 73740053. The reversal of 73740021 is 12004737.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 73740021 - 2⁵ = 73739989 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 73739973 and 73740000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73740091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2826 + ... + 12468.

It is an arithmetic number, because the mean of its divisors is an integer number (12296100).

Almost surely, 2^73740021 is an apocalyptic number.

It is an amenable number.

73740021 is a deficient number, since it is larger than the sum of its proper divisors (24628779).

73740021 is a wasteful number, since it uses less digits than its factorization.

73740021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12195.

The product of its (nonzero) digits is 1176, while the sum is 24.

The square root of 73740021 is about 8587.2009991615. The cubic root of 73740021 is about 419.3414111379.

Adding to 73740021 its reverse (12004737), we get a palindrome (85744758).

The spelling of 73740021 in words is "seventy-three million, seven hundred forty thousand, twenty-one".