123906397 has 4 divisors (see below), whose sum is σ = 124034976. Its totient is φ = 123777820.

The previous prime is 123906329. The next prime is 123906403. The reversal of 123906397 is 793609321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 793609321 = 383 ⋅2072087.

It is a cyclic number.

It is not a de Polignac number, because 123906397 - 2¹¹ = 123904349 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123906317) 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, 62833 + ... + 64774.

It is an arithmetic number, because the mean of its divisors is an integer number (31008744).

Almost surely, 2^123906397 is an apocalyptic number.

It is an amenable number.

123906397 is a deficient number, since it is larger than the sum of its proper divisors (128579).

123906397 is an equidigital number, since it uses as much as digits as its factorization.

123906397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128578.

The product of its (nonzero) digits is 61236, while the sum is 40.

The square root of 123906397 is about 11131.3250334360. The cubic root of 123906397 is about 498.5375895481.

The spelling of 123906397 in words is "one hundred twenty-three million, nine hundred six thousand, three hundred ninety-seven".