126663989 has 8 divisors (see below), whose sum is σ = 128260608. Its totient is φ = 125077680.

The previous prime is 126663961. The next prime is 126663997. The reversal of 126663989 is 989366621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126663989 is a prime.

It is a super-2 number, since 2×126663989² = 32087532218784242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126663949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23804 + ... + 28634.

It is an arithmetic number, because the mean of its divisors is an integer number (16032576).

Almost surely, 2^126663989 is an apocalyptic number.

It is an amenable number.

126663989 is a deficient number, since it is larger than the sum of its proper divisors (1596619).

126663989 is a wasteful number, since it uses less digits than its factorization.

126663989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5155.

The product of its digits is 839808, while the sum is 50.

The square root of 126663989 is about 11254.5097183307. The cubic root of 126663989 is about 502.2088793342.

The spelling of 126663989 in words is "one hundred twenty-six million, six hundred sixty-three thousand, nine hundred eighty-nine".