72193997 has 4 divisors (see below), whose sum is σ = 72349056. Its totient is φ = 72038940.

The previous prime is 72193973. The next prime is 72194027. The reversal of 72193997 is 79939127.

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, and also an emirpimes, since its reverse is a distinct semiprime: 79939127 = 547 ⋅146141.

It is a cyclic number.

It is not a de Polignac number, because 72193997 - 2⁸ = 72193741 is a prime.

It is a super-3 number, since 3×72193997³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72193937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76829 + ... + 77762.

It is an arithmetic number, because the mean of its divisors is an integer number (18087264).

Almost surely, 2^72193997 is an apocalyptic number.

It is an amenable number.

72193997 is a deficient number, since it is larger than the sum of its proper divisors (155059).

72193997 is a wasteful number, since it uses less digits than its factorization.

72193997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155058.

The product of its digits is 214326, while the sum is 47.

The square root of 72193997 is about 8496.7050672599. The cubic root of 72193997 is about 416.3900684426.

The spelling of 72193997 in words is "seventy-two million, one hundred ninety-three thousand, nine hundred ninety-seven".