123420401 has 4 divisors (see below), whose sum is σ = 132914292. Its totient is φ = 113926512.

The previous prime is 123420383. The next prime is 123420403. The reversal of 123420401 is 104024321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 104024321 = 4451 ⋅23371.

It can be written as a sum of positive squares in 2 ways, for example, as 63760225 + 59660176 = 7985^2 + 7724^2 .

It is a cyclic number.

It is not a de Polignac number, because 123420401 - 2²⁶ = 56311537 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 123420401.

It is not an unprimeable number, because it can be changed into a prime (123420403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4746926 + ... + 4746951.

It is an arithmetic number, because the mean of its divisors is an integer number (33228573).

Almost surely, 2^123420401 is an apocalyptic number.

It is an amenable number.

123420401 is a deficient number, since it is larger than the sum of its proper divisors (9493891).

123420401 is an equidigital number, since it uses as much as digits as its factorization.

123420401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9493890.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 123420401 is about 11109.4734798729. The cubic root of 123420401 is about 497.8849336040.

Adding to 123420401 its reverse (104024321), we get a palindrome (227444722).

The spelling of 123420401 in words is "one hundred twenty-three million, four hundred twenty thousand, four hundred one".