42455391 has 48 divisors (see below), whose sum is σ = 66712800. Its totient is φ = 23950080.

The previous prime is 42455389. The next prime is 42455423. The reversal of 42455391 is 19355424.

42455391 = 194² + 195² + ... + 512².

It is not a de Polignac number, because 42455391 - 2¹ = 42455389 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

Its product of digits (21600) is a multiple of the sum of its prime factors (200).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42455321) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 389445 + ... + 389553.

It is an arithmetic number, because the mean of its divisors is an integer number (1389850).

Almost surely, 2^42455391 is an apocalyptic number.

42455391 is a deficient number, since it is larger than the sum of its proper divisors (24257409).

42455391 is a wasteful number, since it uses less digits than its factorization.

42455391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200 (or 189 counting only the distinct ones).

The product of its digits is 21600, while the sum is 33.

The square root of 42455391 is about 6515.7801528290. The cubic root of 42455391 is about 348.8544615839.

Adding to 42455391 its sum of digits (33), we get a palindrome (42455424).

The spelling of 42455391 in words is "forty-two million, four hundred fifty-five thousand, three hundred ninety-one".