42640371 has 16 divisors (see below), whose sum is σ = 63442720. Its totient is φ = 28304640.

The previous prime is 42640363. The next prime is 42640393. The reversal of 42640371 is 17304624.

It is not a de Polignac number, because 42640371 - 2³ = 42640363 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42640331) 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, 3231 + ... + 9783.

It is an arithmetic number, because the mean of its divisors is an integer number (3965170).

Almost surely, 2^42640371 is an apocalyptic number.

42640371 is a deficient number, since it is larger than the sum of its proper divisors (20802349).

42640371 is a wasteful number, since it uses less digits than its factorization.

42640371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6803 (or 6797 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 42640371 is about 6529.9594945145. The cubic root of 42640371 is about 349.3603855775.

Adding to 42640371 its reverse (17304624), we get a palindrome (59944995).

The spelling of 42640371 in words is "forty-two million, six hundred forty thousand, three hundred seventy-one".