73870021 has 8 divisors (see below), whose sum is σ = 75075840. Its totient is φ = 72674112.

The previous prime is 73870009. The next prime is 73870031. The reversal of 73870021 is 12007837.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 73870021 - 2⁷ = 73869893 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 (73870031) 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 7 ways as a sum of consecutive naturals, for example, 13356 + ... + 18058.

It is an arithmetic number, because the mean of its divisors is an integer number (9384480).

Almost surely, 2^73870021 is an apocalyptic number.

It is an amenable number.

73870021 is a deficient number, since it is larger than the sum of its proper divisors (1205819).

73870021 is a wasteful number, since it uses less digits than its factorization.

73870021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4955.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 73870021 is about 8594.7670707239. The cubic root of 73870021 is about 419.5876925043.

Adding to 73870021 its reverse (12007837), we get a palindrome (85877858).

The spelling of 73870021 in words is "seventy-three million, eight hundred seventy thousand, twenty-one".