42399780 has 96 divisors (see below), whose sum is σ = 124104960. Its totient is φ = 10805760.

The previous prime is 42399761. The next prime is 42399821. The reversal of 42399780 is 8799324.

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, 157486 + ... + 157754.

It is an arithmetic number, because the mean of its divisors is an integer number (1292760).

Almost surely, 2^42399780 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42399780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62052480).

42399780 is an abundant number, since it is smaller than the sum of its proper divisors (81705180).

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

42399780 is a wasteful number, since it uses less digits than its factorization.

42399780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389 (or 387 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 42399780 is about 6511.5113453023. The cubic root of 42399780 is about 348.7020771499.

The spelling of 42399780 in words is "forty-two million, three hundred ninety-nine thousand, seven hundred eighty".