126639009 has 48 divisors (see below), whose sum is σ = 224839680. Its totient is φ = 67068000.

The previous prime is 126638983. The next prime is 126639011. The reversal of 126639009 is 900936621.

126639009 is a `hidden beast` number, since 1 + 266 + 390 + 0 + 9 = 666.

It is not a de Polignac number, because 126639009 - 2⁷ = 126638881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (126639059) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 55134 + ... + 57384.

It is an arithmetic number, because the mean of its divisors is an integer number (4684160).

Almost surely, 2^126639009 is an apocalyptic number.

126639009 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

126639009 is a deficient number, since it is larger than the sum of its proper divisors (98200671).

126639009 is a wasteful number, since it uses less digits than its factorization.

126639009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2330 (or 2327 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 126639009 is about 11253.3998862566. The cubic root of 126639009 is about 502.1758628400.

The spelling of 126639009 in words is "one hundred twenty-six million, six hundred thirty-nine thousand, nine".