126737997 has 4 divisors (see below), whose sum is σ = 168984000. Its totient is φ = 84491996.

The previous prime is 126737993. The next prime is 126738023. The reversal of 126737997 is 799737621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 799737621 = 3 ⋅266579207.

It is a cyclic number.

It is not a de Polignac number, because 126737997 - 2² = 126737993 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126737993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21122997 + ... + 21123002.

It is an arithmetic number, because the mean of its divisors is an integer number (42246000).

Almost surely, 2^126737997 is an apocalyptic number.

It is an amenable number.

126737997 is a deficient number, since it is larger than the sum of its proper divisors (42246003).

126737997 is an equidigital number, since it uses as much as digits as its factorization.

126737997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42246002.

The product of its digits is 1000188, while the sum is 51.

The square root of 126737997 is about 11257.7971646322. The cubic root of 126737997 is about 502.3066715022.

The spelling of 126737997 in words is "one hundred twenty-six million, seven hundred thirty-seven thousand, nine hundred ninety-seven".