126778381 has 8 divisors (see below), whose sum is σ = 128810304. Its totient is φ = 124753440.

The previous prime is 126778363. The next prime is 126778409. The reversal of 126778381 is 183877621.

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

It is a cyclic number.

It is not a de Polignac number, because 126778381 - 2⁵ = 126778349 is a prime.

It is a super-2 number, since 2×126778381² = 32145515777962322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126778081) 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, 44265 + ... + 47041.

It is an arithmetic number, because the mean of its divisors is an integer number (16101288).

Almost surely, 2^126778381 is an apocalyptic number.

It is an amenable number.

126778381 is a deficient number, since it is larger than the sum of its proper divisors (2031923).

126778381 is an equidigital number, since it uses as much as digits as its factorization.

126778381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3491.

The product of its digits is 112896, while the sum is 43.

The square root of 126778381 is about 11259.5906231088. The cubic root of 126778381 is about 502.3600177728.

The spelling of 126778381 in words is "one hundred twenty-six million, seven hundred seventy-eight thousand, three hundred eighty-one".