997638007 has 2 divisors, whose sum is σ = 997638008. Its totient is φ = 997638006.

The previous prime is 997637989. The next prime is 997638011. The reversal of 997638007 is 700836799.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997638007 is a prime.

It is a congruent number.

It is a weakly prime.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498819003 + 498819004.

It is an arithmetic number, because the mean of its divisors is an integer number (498819004).

Almost surely, 2^997638007 is an apocalyptic number.

997638007 is a deficient number, since it is larger than the sum of its proper divisors (1).

997638007 is an equidigital number, since it uses as much as digits as its factorization.

997638007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 571536, while the sum is 49.

The square root of 997638007 is about 31585.4081341369. The cubic root of 997638007 is about 999.2120482952.

The spelling of 997638007 in words is "nine hundred ninety-seven million, six hundred thirty-eight thousand, seven".