42351440 has 20 divisors (see below), whose sum is σ = 98467284. Its totient is φ = 16940544.

The previous prime is 42351427. The next prime is 42351457. The reversal of 42351440 is 4415324.

It can be written as a sum of positive squares in 2 ways, for example, as 9265936 + 33085504 = 3044^2 + 5752^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 264617 + ... + 264776.

Almost surely, 2^42351440 is an apocalyptic number.

42351440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42351440 is an abundant number, since it is smaller than the sum of its proper divisors (56115844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42351440 is a wasteful number, since it uses less digits than its factorization.

42351440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529406 (or 529400 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 42351440 is about 6507.7983988443. The cubic root of 42351440 is about 348.5695083141.

Adding to 42351440 its reverse (4415324), we get a palindrome (46766764).

The spelling of 42351440 in words is "forty-two million, three hundred fifty-one thousand, four hundred forty".