72042386 has 16 divisors (see below), whose sum is σ = 117973464. Its totient is φ = 32793984.

The previous prime is 72042361. The next prime is 72042389. The reversal of 72042386 is 68324027.

It can be written as a sum of positive squares in 4 ways, for example, as 28890625 + 43151761 = 5375^2 + 6569^2 .

It is not an unprimeable number, because it can be changed into a prime (72042389) 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, 17081 + ... + 20876.

Almost surely, 2^72042386 is an apocalyptic number.

72042386 is a deficient number, since it is larger than the sum of its proper divisors (45931078).

72042386 is a wasteful number, since it uses less digits than its factorization.

72042386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38045.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 72042386 is about 8487.7786257654. The cubic root of 72042386 is about 416.0983841822.

The spelling of 72042386 in words is "seventy-two million, forty-two thousand, three hundred eighty-six".