72942139 has 4 divisors (see below), whose sum is σ = 73162840. Its totient is φ = 72721440.

The previous prime is 72942127. The next prime is 72942161. The reversal of 72942139 is 93124927.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93124927 = 7 ⋅13303561.

It is a cyclic number.

It is not a de Polignac number, because 72942139 - 2¹³ = 72933947 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72942098 and 72942107.

It is not an unprimeable number, because it can be changed into a prime (72942119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109854 + ... + 110515.

It is an arithmetic number, because the mean of its divisors is an integer number (18290710).

Almost surely, 2^72942139 is an apocalyptic number.

72942139 is a deficient number, since it is larger than the sum of its proper divisors (220701).

72942139 is a wasteful number, since it uses less digits than its factorization.

72942139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220700.

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

The square root of 72942139 is about 8540.6170151810. The cubic root of 72942139 is about 417.8234700200.

The spelling of 72942139 in words is "seventy-two million, nine hundred forty-two thousand, one hundred thirty-nine".