42640623 has 6 divisors (see below), whose sum is σ = 61592024. Its totient is φ = 28427076.

The previous prime is 42640603. The next prime is 42640639. The reversal of 42640623 is 32604624.

It is not a de Polignac number, because 42640623 - 2⁹ = 42640111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42640603) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2368915 + ... + 2368932.

Almost surely, 2^42640623 is an apocalyptic number.

42640623 is a deficient number, since it is larger than the sum of its proper divisors (18951401).

42640623 is a wasteful number, since it uses less digits than its factorization.

42640623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4737853 (or 4737850 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

The square root of 42640623 is about 6529.9787901646. The cubic root of 42640623 is about 349.3610738036.

The spelling of 42640623 in words is "forty-two million, six hundred forty thousand, six hundred twenty-three".