123981078 has 16 divisors (see below), whose sum is σ = 267036336. Its totient is φ = 38148000.

The previous prime is 123981073. The next prime is 123981101. The reversal of 123981078 is 870189321.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123981073) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 794673 + ... + 794828.

It is an arithmetic number, because the mean of its divisors is an integer number (16689771).

Almost surely, 2^123981078 is an apocalyptic number.

123981078 is an abundant number, since it is smaller than the sum of its proper divisors (143055258).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123981078 is a wasteful number, since it uses less digits than its factorization.

123981078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1589519.

The product of its (nonzero) digits is 24192, while the sum is 39.

The square root of 123981078 is about 11134.6790703639. The cubic root of 123981078 is about 498.6377291403.

The spelling of 123981078 in words is "one hundred twenty-three million, nine hundred eighty-one thousand, seventy-eight".