9972139 has 2 divisors, whose sum is σ = 9972140. Its totient is φ = 9972138.

The previous prime is 9972119. The next prime is 9972161. The reversal of 9972139 is 9312799.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9972139 - 2¹⁷ = 9841067 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9972119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4986069 + 4986070.

It is an arithmetic number, because the mean of its divisors is an integer number (4986070).

Almost surely, 2^9972139 is an apocalyptic number.

9972139 is a deficient number, since it is larger than the sum of its proper divisors (1).

9972139 is an equidigital number, since it uses as much as digits as its factorization.

9972139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30618, while the sum is 40.

The square root of 9972139 is about 3157.8693766526. The cubic root of 9972139 is about 215.2432005489.

It can be divided in two parts, 997 and 2139, that added together give a square (3136 = 56²).

The spelling of 9972139 in words is "nine million, nine hundred seventy-two thousand, one hundred thirty-nine".