42451538 has 4 divisors (see below), whose sum is σ = 63677310. Its totient is φ = 21225768.

The previous prime is 42451531. The next prime is 42451561. The reversal of 42451538 is 83515424.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 39150049 + 3301489 = 6257^2 + 1817^2 .

It is a super-3 number, since 3×42451538³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (42451531) by changing a digit.

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 as a sum of consecutive naturals, namely, 10612883 + ... + 10612886.

Almost surely, 2^42451538 is an apocalyptic number.

42451538 is a deficient number, since it is larger than the sum of its proper divisors (21225772).

42451538 is a wasteful number, since it uses less digits than its factorization.

42451538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21225771.

The product of its digits is 19200, while the sum is 32.

The square root of 42451538 is about 6515.4844793001. The cubic root of 42451538 is about 348.8439079425.

It can be divided in two parts, 4 and 2451538, that added together give a palindrome (2451542).

The spelling of 42451538 in words is "forty-two million, four hundred fifty-one thousand, five hundred thirty-eight".