999972007 has 2 divisors, whose sum is σ = 999972008. Its totient is φ = 999972006.

The previous prime is 999971993. The next prime is 999972059. The reversal of 999972007 is 700279999.

It is an a-pointer prime, because the next prime (999972059) can be obtained adding 999972007 to its sum of digits (52).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999972007 - 2¹¹ = 999969959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999972067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499986003 + 499986004.

It is an arithmetic number, because the mean of its divisors is an integer number (499986004).

Almost surely, 2^999972007 is an apocalyptic number.

999972007 is a deficient number, since it is larger than the sum of its proper divisors (1).

999972007 is an equidigital number, since it uses as much as digits as its factorization.

999972007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 642978, while the sum is 52.

The square root of 999972007 is about 31622.3339903936. Note that the first 3 decimals coincide. The cubic root of 999972007 is about 999.9906689129.

The spelling of 999972007 in words is "nine hundred ninety-nine million, nine hundred seventy-two thousand, seven".