123213404 has 48 divisors (see below), whose sum is σ = 238761600. Its totient is φ = 55411776.

The previous prime is 123213401. The next prime is 123213427. The reversal of 123213404 is 404312321.

123213404 = 492² + 493² + ... + 787².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123213401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120407 + ... + 121425.

It is an arithmetic number, because the mean of its divisors is an integer number (4974200).

Almost surely, 2^123213404 is an apocalyptic number.

It is an amenable number.

123213404 is a deficient number, since it is larger than the sum of its proper divisors (115548196).

123213404 is a wasteful number, since it uses less digits than its factorization.

123213404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1122 (or 1120 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 123213404 is about 11100.1533322743. The cubic root of 123213404 is about 497.6064319482.

Adding to 123213404 its reverse (404312321), we get a palindrome (527525725).

The spelling of 123213404 in words is "one hundred twenty-three million, two hundred thirteen thousand, four hundred four".