126722989 has 16 divisors (see below), whose sum is σ = 136442880. Its totient is φ = 117342000.

The previous prime is 126722957. The next prime is 126723007. The reversal of 126722989 is 989227621.

It is a cyclic number.

It is not a de Polignac number, because 126722989 - 2⁵ = 126722957 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 (126722909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 168364 + ... + 169114.

It is an arithmetic number, because the mean of its divisors is an integer number (8527680).

Almost surely, 2^126722989 is an apocalyptic number.

126722989 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

126722989 is a deficient number, since it is larger than the sum of its proper divisors (9719891).

126722989 is a wasteful number, since it uses less digits than its factorization.

126722989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 960.

The product of its digits is 217728, while the sum is 46.

The square root of 126722989 is about 11257.1305846561. The cubic root of 126722989 is about 502.2868434152.

The spelling of 126722989 in words is "one hundred twenty-six million, seven hundred twenty-two thousand, nine hundred eighty-nine".