99972403 has 2 divisors, whose sum is σ = 99972404. Its totient is φ = 99972402.

The previous prime is 99972317. The next prime is 99972437. The reversal of 99972403 is 30427999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99972403 - 2¹³ = 99964211 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99972403.

It is not a weakly prime, because it can be changed into another prime (99972503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49986201 + 49986202.

It is an arithmetic number, because the mean of its divisors is an integer number (49986202).

Almost surely, 2^99972403 is an apocalyptic number.

99972403 is a deficient number, since it is larger than the sum of its proper divisors (1).

99972403 is an equidigital number, since it uses as much as digits as its factorization.

99972403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 122472, while the sum is 43.

The square root of 99972403 is about 9998.6200547876. The cubic root of 99972403 is about 464.1161814572.

The spelling of 99972403 in words is "ninety-nine million, nine hundred seventy-two thousand, four hundred three".