126281978 has 4 divisors (see below), whose sum is σ = 189422970. Its totient is φ = 63140988.

The previous prime is 126281971. The next prime is 126281993. The reversal of 126281978 is 879182621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 94731289 + 31550689 = 9733^2 + 5617^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (126281971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31570493 + ... + 31570496.

Almost surely, 2^126281978 is an apocalyptic number.

126281978 is a deficient number, since it is larger than the sum of its proper divisors (63140992).

126281978 is an equidigital number, since it uses as much as digits as its factorization.

126281978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63140991.

The product of its digits is 96768, while the sum is 44.

The square root of 126281978 is about 11237.5254393483. The cubic root of 126281978 is about 501.7034936278.

The spelling of 126281978 in words is "one hundred twenty-six million, two hundred eighty-one thousand, nine hundred seventy-eight".