126405939 has 32 divisors (see below), whose sum is σ = 189446400. Its totient is φ = 74309760.

The previous prime is 126405919. The next prime is 126405943. The reversal of 126405939 is 939504621.

It is not a de Polignac number, because 126405939 - 2¹⁷ = 126274867 is a prime.

It is a super-2 number, since 2×126405939² = 31956922828943442, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 126405897 and 126405906.

It is not an unprimeable number, because it can be changed into a prime (126405919) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 324757 + ... + 325145.

It is an arithmetic number, because the mean of its divisors is an integer number (5920200).

Almost surely, 2^126405939 is an apocalyptic number.

126405939 is a deficient number, since it is larger than the sum of its proper divisors (63040461).

126405939 is a wasteful number, since it uses less digits than its factorization.

126405939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675.

The product of its (nonzero) digits is 58320, while the sum is 39.

The square root of 126405939 is about 11243.0395801136. The cubic root of 126405939 is about 501.8676007825.

The spelling of 126405939 in words is "one hundred twenty-six million, four hundred five thousand, nine hundred thirty-nine".