123745391978 has 32 divisors (see below), whose sum is σ = 213460047360. Its totient is φ = 53364991680.

The previous prime is 123745391941. The next prime is 123745391989. The reversal of 123745391978 is 879193547321.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2623700 + ... + 2670447.

It is an arithmetic number, because the mean of its divisors is an integer number (6670626480).

Almost surely, 2^123745391978 is an apocalyptic number.

123745391978 is a deficient number, since it is larger than the sum of its proper divisors (89714655382).

123745391978 is a wasteful number, since it uses less digits than its factorization.

123745391978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5294222.

The product of its digits is 11430720, while the sum is 59.

The spelling of 123745391978 in words is "one hundred twenty-three billion, seven hundred forty-five million, three hundred ninety-one thousand, nine hundred seventy-eight".