126778939 has 4 divisors (see below), whose sum is σ = 144890224. Its totient is φ = 108667656.

The previous prime is 126778907. The next prime is 126778969. The reversal of 126778939 is 939877621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 939877621 = 107 ⋅8783903.

It is a cyclic number.

It is not a de Polignac number, because 126778939 - 2⁵ = 126778907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126778969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9055632 + ... + 9055645.

It is an arithmetic number, because the mean of its divisors is an integer number (36222556).

Almost surely, 2^126778939 is an apocalyptic number.

126778939 is a deficient number, since it is larger than the sum of its proper divisors (18111285).

126778939 is an equidigital number, since it uses as much as digits as its factorization.

126778939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18111284.

The product of its digits is 1143072, while the sum is 52.

The square root of 126778939 is about 11259.6154019576. The cubic root of 126778939 is about 502.3607547977.

The spelling of 126778939 in words is "one hundred twenty-six million, seven hundred seventy-eight thousand, nine hundred thirty-nine".