123402134015 has 4 divisors (see below), whose sum is σ = 148082560824. Its totient is φ = 98721707208.

The previous prime is 123402133999. The next prime is 123402134033. The reversal of 123402134015 is 510431204321.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 123402134015 - 2⁴ = 123402133999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12340213397 + ... + 12340213406.

It is an arithmetic number, because the mean of its divisors is an integer number (37020640206).

Almost surely, 2^123402134015 is an apocalyptic number.

123402134015 is a deficient number, since it is larger than the sum of its proper divisors (24680426809).

123402134015 is an equidigital number, since it uses as much as digits as its factorization.

123402134015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24680426808.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 123402134015 its reverse (510431204321), we get a palindrome (633833338336).

The spelling of 123402134015 in words is "one hundred twenty-three billion, four hundred two million, one hundred thirty-four thousand, fifteen".