126722987 has 4 divisors (see below), whose sum is σ = 127423296. Its totient is φ = 126022680.

The previous prime is 126722957. The next prime is 126723007. The reversal of 126722987 is 789227621.

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

It is a cyclic number.

It is not a de Polignac number, because 126722987 - 2⁸ = 126722731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126722957) 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, 349883 + ... + 350244.

It is an arithmetic number, because the mean of its divisors is an integer number (31855824).

Almost surely, 2^126722987 is an apocalyptic number.

126722987 is a deficient number, since it is larger than the sum of its proper divisors (700309).

126722987 is an equidigital number, since it uses as much as digits as its factorization.

126722987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700308.

The product of its digits is 169344, while the sum is 44.

The square root of 126722987 is about 11257.1304958235. The cubic root of 126722987 is about 502.2868407728.

The spelling of 126722987 in words is "one hundred twenty-six million, seven hundred twenty-two thousand, nine hundred eighty-seven".