123904390 has 16 divisors (see below), whose sum is σ = 225852480. Its totient is φ = 48934080.

The previous prime is 123904369. The next prime is 123904399. The reversal of 123904390 is 93409321.

It is a super-2 number, since 2×123904390² = 30704595722544200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123904399) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77631 + ... + 79210.

It is an arithmetic number, because the mean of its divisors is an integer number (14115780).

Almost surely, 2^123904390 is an apocalyptic number.

123904390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

123904390 is a deficient number, since it is larger than the sum of its proper divisors (101948090).

123904390 is a wasteful number, since it uses less digits than its factorization.

123904390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156927.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 123904390 is about 11131.2348820784. The cubic root of 123904390 is about 498.5348978110.

The spelling of 123904390 in words is "one hundred twenty-three million, nine hundred four thousand, three hundred ninety".