126538257 has 8 divisors (see below), whose sum is σ = 168773920. Its totient is φ = 84330720.

The previous prime is 126538253. The next prime is 126538283. The reversal of 126538257 is 752835621.

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

It is not a de Polignac number, because 126538257 - 2² = 126538253 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126538253) 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, 8157 + ... + 17877.

It is an arithmetic number, because the mean of its divisors is an integer number (21096740).

Almost surely, 2^126538257 is an apocalyptic number.

It is an amenable number.

126538257 is a deficient number, since it is larger than the sum of its proper divisors (42235663).

126538257 is an equidigital number, since it uses as much as digits as its factorization.

126538257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14063.

The product of its digits is 100800, while the sum is 39.

The square root of 126538257 is about 11248.9224817313. The cubic root of 126538257 is about 502.0426531061.

It can be divided in two parts, 12653 and 8257, that added together give a triangular number (20910 = T₂₀₄).

The spelling of 126538257 in words is "one hundred twenty-six million, five hundred thirty-eight thousand, two hundred fifty-seven".