126320639 has 4 divisors (see below), whose sum is σ = 126536424. Its totient is φ = 126104856.

The previous prime is 126320609. The next prime is 126320641. The reversal of 126320639 is 936023621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126320639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126320609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107012 + ... + 108185.

It is an arithmetic number, because the mean of its divisors is an integer number (31634106).

Almost surely, 2^126320639 is an apocalyptic number.

126320639 is a deficient number, since it is larger than the sum of its proper divisors (215785).

126320639 is an equidigital number, since it uses as much as digits as its factorization.

126320639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215784.

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 126320639 is about 11239.2454817928. The cubic root of 126320639 is about 501.7546869441.

The spelling of 126320639 in words is "one hundred twenty-six million, three hundred twenty thousand, six hundred thirty-nine".