123920001 has 12 divisors (see below), whose sum is σ = 182030160. Its totient is φ = 81212760.

The previous prime is 123919997. The next prime is 123920011. The reversal of 123920001 is 100029321.

It is a happy number.

It is not a de Polignac number, because 123920001 - 2² = 123919997 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123920011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 116155 + ... + 117216.

It is an arithmetic number, because the mean of its divisors is an integer number (15169180).

Almost surely, 2^123920001 is an apocalyptic number.

It is an amenable number.

123920001 is a deficient number, since it is larger than the sum of its proper divisors (58110159).

123920001 is a wasteful number, since it uses less digits than its factorization.

123920001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233436 (or 233433 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 123920001 is about 11131.9360849764. The cubic root of 123920001 is about 498.5558341191. Note that the first 3 decimals are identical.

Adding to 123920001 its reverse (100029321), we get a palindrome (223949322).

The spelling of 123920001 in words is "one hundred twenty-three million, nine hundred twenty thousand, one".