123783681 has 32 divisors (see below), whose sum is σ = 201754368. Its totient is φ = 65894400.

The previous prime is 123783637. The next prime is 123783707. The reversal of 123783681 is 186387321.

It is not a de Polignac number, because 123783681 - 2⁷ = 123783553 is a prime.

It is a super-2 number, since 2×123783681² = 30644799363819522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (123783481) 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, 34341 + ... + 37773.

It is an arithmetic number, because the mean of its divisors is an integer number (6304824).

Almost surely, 2^123783681 is an apocalyptic number.

It is an amenable number.

123783681 is a deficient number, since it is larger than the sum of its proper divisors (77970687).

123783681 is a wasteful number, since it uses less digits than its factorization.

123783681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3561.

The product of its digits is 48384, while the sum is 39.

The square root of 123783681 is about 11125.8114760228. The cubic root of 123783681 is about 498.3729525093.

The spelling of 123783681 in words is "one hundred twenty-three million, seven hundred eighty-three thousand, six hundred eighty-one".