126151978 has 16 divisors (see below), whose sum is σ = 193677480. Its totient is φ = 61603776.

The previous prime is 126151939. The next prime is 126151979. The reversal of 126151978 is 879151621.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 125955729 + 196249 = 11223^2 + 443^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 126151978.

It is not an unprimeable number, because it can be changed into a prime (126151979) 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, 21676 + ... + 26872.

Almost surely, 2^126151978 is an apocalyptic number.

126151978 is a deficient number, since it is larger than the sum of its proper divisors (67525502).

126151978 is a wasteful number, since it uses less digits than its factorization.

126151978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5481.

The product of its digits is 30240, while the sum is 40.

The square root of 126151978 is about 11231.7397583812. The cubic root of 126151978 is about 501.5312762653.

The spelling of 126151978 in words is "one hundred twenty-six million, one hundred fifty-one thousand, nine hundred seventy-eight".