42989940 has 240 divisors, whose sum is σ = 163924992. Its totient is φ = 9206784.

The previous prime is 42989929. The next prime is 42989959. The reversal of 42989940 is 4998924.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 192669 + ... + 192891.

Almost surely, 2^42989940 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 42989940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81962496).

42989940 is an abundant number, since it is smaller than the sum of its proper divisors (120935052).

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

42989940 is a wasteful number, since it uses less digits than its factorization.

42989940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268 (or 257 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 42989940 is about 6556.6714116234. The cubic root of 42989940 is about 350.3124828345.

The spelling of 42989940 in words is "forty-two million, nine hundred eighty-nine thousand, nine hundred forty".