123978755 has 4 divisors (see below), whose sum is σ = 148774512. Its totient is φ = 99183000.

The previous prime is 123978727. The next prime is 123978769. The reversal of 123978755 is 557879321.

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

It is not a de Polignac number, because 123978755 - 2⁸ = 123978499 is a prime.

It is a Duffinian 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, 12397871 + ... + 12397880.

It is an arithmetic number, because the mean of its divisors is an integer number (37193628).

Almost surely, 2^123978755 is an apocalyptic number.

123978755 is a deficient number, since it is larger than the sum of its proper divisors (24795757).

123978755 is an equidigital number, since it uses as much as digits as its factorization.

123978755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24795756.

The product of its digits is 529200, while the sum is 47.

The square root of 123978755 is about 11134.5747561369. The cubic root of 123978755 is about 498.6346148407.

The spelling of 123978755 in words is "one hundred twenty-three million, nine hundred seventy-eight thousand, seven hundred fifty-five".