126509978 has 16 divisors (see below), whose sum is σ = 218866560. Its totient is φ = 53720496.

The previous prime is 126509951. The next prime is 126509987. The reversal of 126509978 is 879905621.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39926 + ... + 42977.

It is an arithmetic number, because the mean of its divisors is an integer number (13679160).

Almost surely, 2^126509978 is an apocalyptic number.

126509978 is a deficient number, since it is larger than the sum of its proper divisors (92356582).

126509978 is a wasteful number, since it uses less digits than its factorization.

126509978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83021.

The product of its (nonzero) digits is 272160, while the sum is 47.

The square root of 126509978 is about 11247.6654466605. The cubic root of 126509978 is about 502.0052511845.

The spelling of 126509978 in words is "one hundred twenty-six million, five hundred nine thousand, nine hundred seventy-eight".