123705149 has 4 divisors (see below), whose sum is σ = 123729600. Its totient is φ = 123680700.

The previous prime is 123705139. The next prime is 123705157. The reversal of 123705149 is 941507321.

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: 941507321 = 2351 ⋅400471.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123705149 is a prime.

It is a super-2 number, since 2×123705149² = 30605927778224402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123705119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1499 + ... + 15800.

It is an arithmetic number, because the mean of its divisors is an integer number (30932400).

Almost surely, 2^123705149 is an apocalyptic number.

It is an amenable number.

123705149 is a deficient number, since it is larger than the sum of its proper divisors (24451).

123705149 is an equidigital number, since it uses as much as digits as its factorization.

123705149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24450.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 123705149 is about 11122.2816454179. The cubic root of 123705149 is about 498.2675360706.

The spelling of 123705149 in words is "one hundred twenty-three million, seven hundred five thousand, one hundred forty-nine".