72390946 has 4 divisors (see below), whose sum is σ = 108586422. Its totient is φ = 36195472.

The previous prime is 72390919. The next prime is 72390971. The reversal of 72390946 is 64909327.

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

It can be written as a sum of positive squares in only one way, i.e., 50253921 + 22137025 = 7089^2 + 4705^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 72390899 and 72390908.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18097735 + ... + 18097738.

Almost surely, 2^72390946 is an apocalyptic number.

72390946 is a deficient number, since it is larger than the sum of its proper divisors (36195476).

72390946 is a wasteful number, since it uses less digits than its factorization.

72390946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36195475.

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 72390946 is about 8508.2869016036. The cubic root of 72390946 is about 416.7683692716.

The spelling of 72390946 in words is "seventy-two million, three hundred ninety thousand, nine hundred forty-six".