123421705 has 16 divisors (see below), whose sum is σ = 163986624. Its totient is φ = 88418880.

The previous prime is 123421699. The next prime is 123421759. The reversal of 123421705 is 507124321.

It is a happy number.

It is not a de Polignac number, because 123421705 - 2⁵ = 123421673 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 123421705.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13062 + ... + 20431.

It is an arithmetic number, because the mean of its divisors is an integer number (10249164).

Almost surely, 2^123421705 is an apocalyptic number.

It is an amenable number.

123421705 is a deficient number, since it is larger than the sum of its proper divisors (40564919).

123421705 is a wasteful number, since it uses less digits than its factorization.

123421705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33576.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 123421705 is about 11109.5321683678. The cubic root of 123421705 is about 497.8866870679.

The spelling of 123421705 in words is "one hundred twenty-three million, four hundred twenty-one thousand, seven hundred five".