42345261 has 60 divisors (see below), whose sum is σ = 75480768. Its totient is φ = 23578128.

The previous prime is 42345223. The next prime is 42345263. The reversal of 42345261 is 16254324.

It is not a de Polignac number, because 42345261 - 2⁶ = 42345197 is a prime.

It is a super-2 number, since 2×42345261² = 3586242258316242, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42345263) 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 59 ways as a sum of consecutive naturals, for example, 186430 + ... + 186656.

Almost surely, 2^42345261 is an apocalyptic number.

It is an amenable number.

42345261 is a deficient number, since it is larger than the sum of its proper divisors (33135507).

42345261 is a wasteful number, since it uses less digits than its factorization.

42345261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300 (or 284 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 42345261 is about 6507.3236434036. The cubic root of 42345261 is about 348.5525555986.

Adding to 42345261 its reverse (16254324), we get a palindrome (58599585).

The spelling of 42345261 in words is "forty-two million, three hundred forty-five thousand, two hundred sixty-one".