42125778 has 64 divisors (see below), whose sum is σ = 97977600. Its totient is φ = 13403520.

The previous prime is 42125761. The next prime is 42125789. The reversal of 42125778 is 87752124.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 117163 + ... + 117521.

It is an arithmetic number, because the mean of its divisors is an integer number (1530900).

Almost surely, 2^42125778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42125778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48988800).

42125778 is an abundant number, since it is smaller than the sum of its proper divisors (55851822).

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

42125778 is a wasteful number, since it uses less digits than its factorization.

42125778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464 (or 458 counting only the distinct ones).

The product of its digits is 31360, while the sum is 36.

The square root of 42125778 is about 6490.4374274774. The cubic root of 42125778 is about 347.9493089066.

The spelling of 42125778 in words is "forty-two million, one hundred twenty-five thousand, seven hundred seventy-eight".