42640403 has 16 divisors (see below), whose sum is σ = 49434336. Its totient is φ = 36426240.

The previous prime is 42640393. The next prime is 42640417. The reversal of 42640403 is 30404624.

It is a happy number.

It is not a de Polignac number, because 42640403 - 2¹⁶ = 42574867 is a prime.

It is a Duffinian 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 15 ways as a sum of consecutive naturals, for example, 11900 + ... + 15062.

It is an arithmetic number, because the mean of its divisors is an integer number (3089646).

Almost surely, 2^42640403 is an apocalyptic number.

42640403 is a deficient number, since it is larger than the sum of its proper divisors (6793933).

42640403 is a wasteful number, since it uses less digits than its factorization.

42640403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3254.

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 42640403 is about 6529.9619447589. The cubic root of 42640403 is about 349.3604729714.

The spelling of 42640403 in words is "forty-two million, six hundred forty thousand, four hundred three".