123826781 has 32 divisors (see below), whose sum is σ = 148176000. Its totient is φ = 102428928.

The previous prime is 123826739. The next prime is 123826823. The reversal of 123826781 is 187628321.

It is an interprime number because it is at equal distance from previous prime (123826739) and next prime (123826823).

It is not a de Polignac number, because 123826781 - 2²⁶ = 56717917 is a prime.

It is a super-2 number, since 2×123826781² = 30666143385643922, 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 (123826711) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 422471 + ... + 422763.

It is an arithmetic number, because the mean of its divisors is an integer number (4630500).

Almost surely, 2^123826781 is an apocalyptic number.

It is an amenable number.

123826781 is a deficient number, since it is larger than the sum of its proper divisors (24349219).

123826781 is a wasteful number, since it uses less digits than its factorization.

123826781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413.

The product of its digits is 32256, while the sum is 38.

The square root of 123826781 is about 11127.7482448157. The cubic root of 123826781 is about 498.4307883014.

The spelling of 123826781 in words is "one hundred twenty-three million, eight hundred twenty-six thousand, seven hundred eighty-one".