123378137 has 4 divisors (see below), whose sum is σ = 126247440. Its totient is φ = 120508836.

The previous prime is 123378127. The next prime is 123378139. The reversal of 123378137 is 731873321.

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: 731873321 = 197 ⋅3715093.

It is a cyclic number.

It is not a de Polignac number, because 123378137 - 2⁴ = 123378121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123378097 and 123378106.

It is not an unprimeable number, because it can be changed into a prime (123378139) 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, 1434587 + ... + 1434672.

It is an arithmetic number, because the mean of its divisors is an integer number (31561860).

Almost surely, 2^123378137 is an apocalyptic number.

It is an amenable number.

123378137 is a deficient number, since it is larger than the sum of its proper divisors (2869303).

123378137 is an equidigital number, since it uses as much as digits as its factorization.

123378137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2869302.

The product of its digits is 21168, while the sum is 35.

The square root of 123378137 is about 11107.5711566481. The cubic root of 123378137 is about 497.8280953205.

The spelling of 123378137 in words is "one hundred twenty-three million, three hundred seventy-eight thousand, one hundred thirty-seven".