42605739 has 24 divisors (see below), whose sum is σ = 67816944. Its totient is φ = 25560000.

The previous prime is 42605699. The next prime is 42605747. The reversal of 42605739 is 93750624.

42605739 is a `hidden beast` number, since 42 + 605 + 7 + 3 + 9 = 666.

It is not a de Polignac number, because 42605739 - 2⁸ = 42605483 is a prime.

It is a super-2 number, since 2×42605739² = 3630497991472242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42605779) 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, 7869 + ... + 12129.

It is an arithmetic number, because the mean of its divisors is an integer number (2825706).

Almost surely, 2^42605739 is an apocalyptic number.

42605739 is a deficient number, since it is larger than the sum of its proper divisors (25211205).

42605739 is a wasteful number, since it uses less digits than its factorization.

42605739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4379 (or 4376 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 42605739 is about 6527.3071783087. The cubic root of 42605739 is about 349.2657778491.

It can be divided in two parts, 4260 and 5739, that added together give a palindrome (9999).

The spelling of 42605739 in words is "forty-two million, six hundred five thousand, seven hundred thirty-nine".