123739387 has 2 divisors, whose sum is σ = 123739388. Its totient is φ = 123739386.

The previous prime is 123739367. The next prime is 123739403. The reversal of 123739387 is 783937321.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123739387 is a prime.

It is a super-2 number, since 2×123739387² = 30622871790271538, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (123739367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61869693 + 61869694.

It is an arithmetic number, because the mean of its divisors is an integer number (61869694).

Almost surely, 2^123739387 is an apocalyptic number.

123739387 is a deficient number, since it is larger than the sum of its proper divisors (1).

123739387 is an equidigital number, since it uses as much as digits as its factorization.

123739387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 190512, while the sum is 43.

The square root of 123739387 is about 11123.8207015396. The cubic root of 123739387 is about 498.3135005014.

The spelling of 123739387 in words is "one hundred twenty-three million, seven hundred thirty-nine thousand, three hundred eighty-seven".