126778387 has 4 divisors (see below), whose sum is σ = 126859176. Its totient is φ = 126697600.

The previous prime is 126778363. The next prime is 126778409. The reversal of 126778387 is 783877621.

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

It is a cyclic number.

It is not a de Polignac number, because 126778387 - 2⁷ = 126778259 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 126778387.

It is not an unprimeable number, because it can be changed into a prime (126778187) 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, 37993 + ... + 41194.

It is an arithmetic number, because the mean of its divisors is an integer number (31714794).

Almost surely, 2^126778387 is an apocalyptic number.

126778387 is a deficient number, since it is larger than the sum of its proper divisors (80789).

126778387 is an equidigital number, since it uses as much as digits as its factorization.

126778387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80788.

The product of its digits is 790272, while the sum is 49.

The square root of 126778387 is about 11259.5908895483. The cubic root of 126778387 is about 502.3600256978.

The spelling of 126778387 in words is "one hundred twenty-six million, seven hundred seventy-eight thousand, three hundred eighty-seven".