42040425 has 24 divisors (see below), whose sum is σ = 79437376. Its totient is φ = 19218240.

The previous prime is 42040421. The next prime is 42040447. The reversal of 42040425 is 52404024.

It is not a de Polignac number, because 42040425 - 2² = 42040421 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42040421) 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, 39514 + ... + 40563.

Almost surely, 2^42040425 is an apocalyptic number.

It is an amenable number.

42040425 is a deficient number, since it is larger than the sum of its proper divisors (37396951).

42040425 is a wasteful number, since it uses less digits than its factorization.

42040425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80097 (or 80092 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 21.

The square root of 42040425 is about 6483.8588047551. The cubic root of 42040425 is about 347.7141512491.

Adding to 42040425 its reverse (52404024), we get a palindrome (94444449).

The spelling of 42040425 in words is "forty-two million, forty thousand, four hundred twenty-five".