73021405 has 4 divisors (see below), whose sum is σ = 87625692. Its totient is φ = 58417120.

The previous prime is 73021393. The next prime is 73021433. The reversal of 73021405 is 50412037.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50412037 = 13 ⋅3877849.

It can be written as a sum of positive squares in 2 ways, for example, as 56715961 + 16305444 = 7531^2 + 4038^2 .

It is not a de Polignac number, because 73021405 - 2²³ = 64632797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7302136 + ... + 7302145.

It is an arithmetic number, because the mean of its divisors is an integer number (21906423).

Almost surely, 2^73021405 is an apocalyptic number.

It is an amenable number.

73021405 is a deficient number, since it is larger than the sum of its proper divisors (14604287).

73021405 is a wasteful number, since it uses less digits than its factorization.

73021405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14604286.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 73021405 is about 8545.2562863849. The cubic root of 73021405 is about 417.9747643930.

The spelling of 73021405 in words is "seventy-three million, twenty-one thousand, four hundred five".