42990738 has 96 divisors (see below), whose sum is σ = 106375680. Its totient is φ = 11531520.

The previous prime is 42990683. The next prime is 42990793. The reversal of 42990738 is 83709924.

It is an interprime number because it is at equal distance from previous prime (42990683) and next prime (42990793).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 42990738.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 482998 + ... + 483086.

It is an arithmetic number, because the mean of its divisors is an integer number (1108080).

Almost surely, 2^42990738 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42990738, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53187840).

42990738 is an abundant number, since it is smaller than the sum of its proper divisors (63384942).

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

42990738 is a wasteful number, since it uses less digits than its factorization.

42990738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192 (or 185 counting only the distinct ones).

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

The square root of 42990738 is about 6556.7322653895. The cubic root of 42990738 is about 350.3146503775.

The spelling of 42990738 in words is "forty-two million, nine hundred ninety thousand, seven hundred thirty-eight".