990403387 has 2 divisors, whose sum is σ = 990403388. Its totient is φ = 990403386.

The previous prime is 990403363. The next prime is 990403399. The reversal of 990403387 is 783304099.

It is a strong prime.

It is an emirp because it is prime and its reverse (783304099) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-990403387 is a prime.

It is not a weakly prime, because it can be changed into another prime (990403987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495201693 + 495201694.

It is an arithmetic number, because the mean of its divisors is an integer number (495201694).

Almost surely, 2^990403387 is an apocalyptic number.

990403387 is a deficient number, since it is larger than the sum of its proper divisors (1).

990403387 is an equidigital number, since it uses as much as digits as its factorization.

990403387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 990403387 is about 31470.6750324806. The cubic root of 990403387 is about 996.7908413173.

The spelling of 990403387 in words is "nine hundred ninety million, four hundred three thousand, three hundred eighty-seven".