42997950 has 144 divisors (see below), whose sum is σ = 125349120. Its totient is φ = 10532160.

The previous prime is 42997943. The next prime is 42997951. The reversal of 42997950 is 5979924.

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

It is a junction number, because it is equal to n+sod(n) for n = 42997896 and 42997905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42997951) by changing a digit.

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 71 ways as a sum of consecutive naturals, for example, 401797 + ... + 401903.

It is an arithmetic number, because the mean of its divisors is an integer number (870480).

Almost surely, 2^42997950 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42997950, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62674560).

42997950 is an abundant number, since it is smaller than the sum of its proper divisors (82351170).

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

42997950 is a wasteful number, since it uses less digits than its factorization.

42997950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191 (or 183 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 45.

The square root of 42997950 is about 6557.2822114044. The cubic root of 42997950 is about 350.3342385347.

The spelling of 42997950 in words is "forty-two million, nine hundred ninety-seven thousand, nine hundred fifty".