102123978 has 32 divisors (see below), whose sum is σ = 223618752. Its totient is φ = 30835200.

The previous prime is 102123977. The next prime is 102124037. The reversal of 102123978 is 879321201.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (102123971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16698 + ... + 21978.

It is an arithmetic number, because the mean of its divisors is an integer number (6988086).

Almost surely, 2^102123978 is an apocalyptic number.

102123978 is an abundant number, since it is smaller than the sum of its proper divisors (121494774).

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

102123978 is a wasteful number, since it uses less digits than its factorization.

102123978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5590.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 102123978 is about 10105.6409000122. The cubic root of 102123978 is about 467.4220987950.

The spelling of 102123978 in words is "one hundred two million, one hundred twenty-three thousand, nine hundred seventy-eight".