123540929 has 4 divisors (see below), whose sum is σ = 123763284. Its totient is φ = 123318576.

The previous prime is 123540883. The next prime is 123540931. The reversal of 123540929 is 929045321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5166529 + 118374400 = 2273^2 + 10880^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123540929 is a prime.

It is a super-2 number, since 2×123540929² = 30524722276366082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123540829) 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, 110342 + ... + 111455.

It is an arithmetic number, because the mean of its divisors is an integer number (30940821).

Almost surely, 2^123540929 is an apocalyptic number.

It is an amenable number.

123540929 is a deficient number, since it is larger than the sum of its proper divisors (222355).

123540929 is an equidigital number, since it uses as much as digits as its factorization.

123540929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222354.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 123540929 is about 11114.8967156695. The cubic root of 123540929 is about 498.0469531489.

The spelling of 123540929 in words is "one hundred twenty-three million, five hundred forty thousand, nine hundred twenty-nine".