42781911 has 16 divisors (see below), whose sum is σ = 60578784. Its totient is φ = 26763264.

The previous prime is 42781889. The next prime is 42781927. The reversal of 42781911 is 11918724.

It is not a de Polignac number, because 42781911 - 2⁶ = 42781847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42781951) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19191 + ... + 21303.

It is an arithmetic number, because the mean of its divisors is an integer number (3786174).

Almost surely, 2^42781911 is an apocalyptic number.

42781911 is a deficient number, since it is larger than the sum of its proper divisors (17796873).

42781911 is a wasteful number, since it uses less digits than its factorization.

42781911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2530.

The product of its digits is 4032, while the sum is 33.

The square root of 42781911 is about 6540.7882552488. The cubic root of 42781911 is about 349.7465130554.

The spelling of 42781911 in words is "forty-two million, seven hundred eighty-one thousand, nine hundred eleven".