405720073 has 8 divisors (see below), whose sum is σ = 443328480. Its totient is φ = 368232480.

The previous prime is 405720043. The next prime is 405720097. The reversal of 405720073 is 370027504.

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

It is not a de Polignac number, because 405720073 - 2¹⁷ = 405589001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405720013) 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, 23103 + ... + 36676.

It is an arithmetic number, because the mean of its divisors is an integer number (55416060).

Almost surely, 2^405720073 is an apocalyptic number.

It is an amenable number.

405720073 is a deficient number, since it is larger than the sum of its proper divisors (37608407).

405720073 is a wasteful number, since it uses less digits than its factorization.

405720073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60407.

The product of its (nonzero) digits is 5880, while the sum is 28.

The square root of 405720073 is about 20142.4942100029. The cubic root of 405720073 is about 740.3018448427.

Adding to 405720073 its reverse (370027504), we get a palindrome (775747577).

The spelling of 405720073 in words is "four hundred five million, seven hundred twenty thousand, seventy-three".