42917940 has 72 divisors (see below), whose sum is σ = 140206248. Its totient is φ = 10563840.

The previous prime is 42917929. The next prime is 42917971. The reversal of 42917940 is 4971924.

It can be written as a sum of positive squares in 4 ways, for example, as 459684 + 42458256 = 678^2 + 6516^2 .

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 42917895 and 42917904.

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 23 ways as a sum of consecutive naturals, for example, 6831 + ... + 11510.

It is an arithmetic number, because the mean of its divisors is an integer number (1947309).

Almost surely, 2^42917940 is an apocalyptic number.

It is an amenable number.

42917940 is an abundant number, since it is smaller than the sum of its proper divisors (97288308).

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

42917940 is a wasteful number, since it uses less digits than its factorization.

42917940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18369 (or 18364 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 42917940 is about 6551.1785199306. The cubic root of 42917940 is about 350.1168045522.

The spelling of 42917940 in words is "forty-two million, nine hundred seventeen thousand, nine hundred forty".