126789431 has 4 divisors (see below), whose sum is σ = 126814200. Its totient is φ = 126764664.

The previous prime is 126789419. The next prime is 126789433. The reversal of 126789431 is 134987621.

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 126789431 - 2¹⁰ = 126788407 is a prime.

It is a super-2 number, since 2×126789431² = 32151119626607522, 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 (126789433) 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, 1541 + ... + 15998.

It is an arithmetic number, because the mean of its divisors is an integer number (31703550).

Almost surely, 2^126789431 is an apocalyptic number.

126789431 is a deficient number, since it is larger than the sum of its proper divisors (24769).

126789431 is an equidigital number, since it uses as much as digits as its factorization.

126789431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24768.

The product of its digits is 72576, while the sum is 41.

The square root of 126789431 is about 11260.0813052127. The cubic root of 126789431 is about 502.3746125770.

The spelling of 126789431 in words is "one hundred twenty-six million, seven hundred eighty-nine thousand, four hundred thirty-one".