72142399 has 4 divisors (see below), whose sum is σ = 82448464. Its totient is φ = 61836336.

The previous prime is 72142397. The next prime is 72142403. The reversal of 72142399 is 99324127.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72142399 - 2¹ = 72142397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72142393) 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, 5153022 + ... + 5153035.

It is an arithmetic number, because the mean of its divisors is an integer number (20612116).

Almost surely, 2^72142399 is an apocalyptic number.

72142399 is a deficient number, since it is larger than the sum of its proper divisors (10306065).

72142399 is a wasteful number, since it uses less digits than its factorization.

72142399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10306064.

The product of its digits is 27216, while the sum is 37.

The square root of 72142399 is about 8493.6681710554. The cubic root of 72142399 is about 416.2908449790.

The spelling of 72142399 in words is "seventy-two million, one hundred forty-two thousand, three hundred ninety-nine".