42781900 has 54 divisors (see below), whose sum is σ = 108006108. Its totient is φ = 14666400.

The previous prime is 42781889. The next prime is 42781927. The reversal of 42781900 is 918724.

It is a super-2 number, since 2×42781900² = 3660581935220000, which contains 22 as substring.

It is a plaindrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 535 + ... + 9265.

Almost surely, 2^42781900 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 42781900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54003054).

42781900 is an abundant number, since it is smaller than the sum of its proper divisors (65224208).

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

42781900 is a wasteful number, since it uses less digits than its factorization.

42781900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8759 (or 8745 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 42781900 is about 6540.7874143715. The cubic root of 42781900 is about 349.7464830801.

It can be divided in two parts, 42781 and 900, that added together give a square (43681 = 209²).

The spelling of 42781900 in words is "forty-two million, seven hundred eighty-one thousand, nine hundred".