126778915 has 8 divisors (see below), whose sum is σ = 155005488. Its totient is φ = 99509280.

The previous prime is 126778907. The next prime is 126778969. The reversal of 126778915 is 519877621.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 126778915 - 2³ = 126778907 is a prime.

It is a Duffinian number.

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, 238941 + ... + 239470.

It is an arithmetic number, because the mean of its divisors is an integer number (19375686).

Almost surely, 2^126778915 is an apocalyptic number.

126778915 is a deficient number, since it is larger than the sum of its proper divisors (28226573).

126778915 is an equidigital number, since it uses as much as digits as its factorization.

126778915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478469.

The product of its digits is 211680, while the sum is 46.

The square root of 126778915 is about 11259.6143362018. The cubic root of 126778915 is about 502.3607230978.

The spelling of 126778915 in words is "one hundred twenty-six million, seven hundred seventy-eight thousand, nine hundred fifteen".