72206139 has 8 divisors (see below), whose sum is σ = 96482880. Its totient is φ = 48033416.

The previous prime is 72206119. The next prime is 72206179. The reversal of 72206139 is 93160227.

72206139 = T₃₀₆ + T₃₀₇ + ... + T₇₇₂.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72206139 - 2¹³ = 72197947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72206119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24369 + ... + 27170.

It is an arithmetic number, because the mean of its divisors is an integer number (12060360).

Almost surely, 2^72206139 is an apocalyptic number.

72206139 is a deficient number, since it is larger than the sum of its proper divisors (24276741).

72206139 is a wasteful number, since it uses less digits than its factorization.

72206139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52009.

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 72206139 is about 8497.4195494868. The cubic root of 72206139 is about 416.4134107564.

The spelling of 72206139 in words is "seventy-two million, two hundred six thousand, one hundred thirty-nine".