72173401 has 4 divisors (see below), whose sum is σ = 72219600. Its totient is φ = 72127204.

The previous prime is 72173399. The next prime is 72173441. The reversal of 72173401 is 10437127.

It is a happy number.

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 not a de Polignac number, because 72173401 - 2¹ = 72173399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72173441) 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 3 ways as a sum of consecutive naturals, for example, 20671 + ... + 23908.

It is an arithmetic number, because the mean of its divisors is an integer number (18054900).

Almost surely, 2^72173401 is an apocalyptic number.

It is an amenable number.

72173401 is a deficient number, since it is larger than the sum of its proper divisors (46199).

72173401 is a wasteful number, since it uses less digits than its factorization.

72173401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46198.

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 72173401 is about 8495.4929815756. The cubic root of 72173401 is about 416.3504678023.

The spelling of 72173401 in words is "seventy-two million, one hundred seventy-three thousand, four hundred one".