42561855 has 40 divisors (see below), whose sum is σ = 87201312. Its totient is φ = 19455552.

The previous prime is 42561851. The next prime is 42561859. The reversal of 42561855 is 55816524.

42561855 is a `hidden beast` number, since 42 + 561 + 8 + 55 = 666.

It is an interprime number because it is at equal distance from previous prime (42561851) and next prime (42561859).

It is not a de Polignac number, because 42561855 - 2² = 42561851 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42561851) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 4672 + ... + 10341.

Almost surely, 2^42561855 is an apocalyptic number.

42561855 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

42561855 is an abundant number, since it is smaller than the sum of its proper divisors (44639457).

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

42561855 is a wasteful number, since it uses less digits than its factorization.

42561855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15037 (or 15028 counting only the distinct ones).

The product of its digits is 48000, while the sum is 36.

The square root of 42561855 is about 6523.9447422553. The cubic root of 42561855 is about 349.1458218282.

The spelling of 42561855 in words is "forty-two million, five hundred sixty-one thousand, eight hundred fifty-five".