42451839 has 24 divisors (see below), whose sum is σ = 66690000. Its totient is φ = 25913088.

The previous prime is 42451837. The next prime is 42451847. The reversal of 42451839 is 93815424.

It is not a de Polignac number, because 42451839 - 2¹ = 42451837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42451831) 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, 1912 + ... + 9410.

It is an arithmetic number, because the mean of its divisors is an integer number (2778750).

Almost surely, 2^42451839 is an apocalyptic number.

42451839 is a deficient number, since it is larger than the sum of its proper divisors (24238161).

42451839 is a wasteful number, since it uses less digits than its factorization.

42451839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7559 (or 7556 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 42451839 is about 6515.5075780786. The cubic root of 42451839 is about 348.8447324260.

It can be divided in two parts, 4245 and 1839, that added together give a square (6084 = 78²).

The spelling of 42451839 in words is "forty-two million, four hundred fifty-one thousand, eight hundred thirty-nine".