42979780 has 12 divisors (see below), whose sum is σ = 90257580. Its totient is φ = 17191904.

The previous prime is 42979771. The next prime is 42979817. The reversal of 42979780 is 8797924.

42979780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 16908544 + 26071236 = 4112^2 + 5106^2 .

It is a super-2 number, since 2×42979780² = 3694522977696800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 42979780.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1074475 + ... + 1074514.

It is an arithmetic number, because the mean of its divisors is an integer number (7521465).

Almost surely, 2^42979780 is an apocalyptic number.

It is an amenable number.

42979780 is an abundant number, since it is smaller than the sum of its proper divisors (47277800).

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

42979780 is a wasteful number, since it uses less digits than its factorization.

42979780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2148998 (or 2148996 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 42979780 is about 6555.8965824668. The cubic root of 42979780 is about 350.2848837013.

The spelling of 42979780 in words is "forty-two million, nine hundred seventy-nine thousand, seven hundred eighty".