125949978 has 160 divisors (see below), whose sum is σ = 367994880. Its totient is φ = 31220640.

The previous prime is 125949907. The next prime is 125949979. The reversal of 125949978 is 879949521.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (125949979) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 286683 + ... + 287121.

It is an arithmetic number, because the mean of its divisors is an integer number (2299968).

Almost surely, 2^125949978 is an apocalyptic number.

125949978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 125949978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (183997440).

125949978 is an abundant number, since it is smaller than the sum of its proper divisors (242044902).

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

125949978 is a wasteful number, since it uses less digits than its factorization.

125949978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494 (or 485 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 54.

The square root of 125949978 is about 11222.7437821595. The cubic root of 125949978 is about 501.2634420725.

The spelling of 125949978 in words is "one hundred twenty-five million, nine hundred forty-nine thousand, nine hundred seventy-eight".