42973920 has 144 divisors (see below), whose sum is σ = 160039152. Its totient is φ = 10414080.

The previous prime is 42973919. The next prime is 42973927. The reversal of 42973920 is 2937924.

It is a tau number, because it is divible by the number of its divisors (144).

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 congruent number.

It is not an unprimeable number, because it can be changed into a prime (42973927) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14484 + ... + 17196.

It is an arithmetic number, because the mean of its divisors is an integer number (1111383).

Almost surely, 2^42973920 is an apocalyptic number.

42973920 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42973920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80019576).

42973920 is an abundant number, since it is smaller than the sum of its proper divisors (117065232).

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

42973920 is a wasteful number, since it uses less digits than its factorization.

42973920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2745 (or 2734 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 42973920 is about 6555.4496413290. The cubic root of 42973920 is about 350.2689633257.

The spelling of 42973920 in words is "forty-two million, nine hundred seventy-three thousand, nine hundred twenty".