72403913 has 2 divisors, whose sum is σ = 72403914. Its totient is φ = 72403912.

The previous prime is 72403907. The next prime is 72403921. The reversal of 72403913 is 31930427.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59644729 + 12759184 = 7723^2 + 3572^2 .

It is a cyclic number.

It is not a de Polignac number, because 72403913 - 2⁴ = 72403897 is a prime.

It is not a weakly prime, because it can be changed into another prime (72403963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36201956 + 36201957.

It is an arithmetic number, because the mean of its divisors is an integer number (36201957).

Almost surely, 2^72403913 is an apocalyptic number.

It is an amenable number.

72403913 is a deficient number, since it is larger than the sum of its proper divisors (1).

72403913 is an equidigital number, since it uses as much as digits as its factorization.

72403913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 72403913 is about 8509.0488892708. The cubic root of 72403913 is about 416.7932522765.

The spelling of 72403913 in words is "seventy-two million, four hundred three thousand, nine hundred thirteen".