123406705 has 8 divisors (see below), whose sum is σ = 148907304. Its totient is φ = 98179200.

The previous prime is 123406693. The next prime is 123406711. The reversal of 123406705 is 507604321.

It can be written as a sum of positive squares in 4 ways, for example, as 5987809 + 117418896 = 2447^2 + 10836^2 .

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

It is not a de Polignac number, because 123406705 - 2²³ = 115018097 is a prime.

It is a super-4 number, since 4×123406705⁴ (a number of 33 digits) contains 4444 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67276 + ... + 69085.

It is an arithmetic number, because the mean of its divisors is an integer number (18613413).

Almost surely, 2^123406705 is an apocalyptic number.

It is an amenable number.

123406705 is a deficient number, since it is larger than the sum of its proper divisors (25500599).

123406705 is a wasteful number, since it uses less digits than its factorization.

123406705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136547.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 123406705 is about 11108.8570519203. The cubic root of 123406705 is about 497.8665161078.

The spelling of 123406705 in words is "one hundred twenty-three million, four hundred six thousand, seven hundred five".