40451 has 4 divisors (see below), whose sum is σ = 42600. Its totient is φ = 38304.

The previous prime is 40433. The next prime is 40459. The reversal of 40451 is 15404.

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

It is not a de Polignac number, because 40451 - 2⁶ = 40387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1046 + ... + 1083.

It is an arithmetic number, because the mean of its divisors is an integer number (10650).

2⁴⁰⁴⁵¹ is an apocalyptic number.

40451 is a deficient number, since it is larger than the sum of its proper divisors (2149).

40451 is a wasteful number, since it uses less digits than its factorization.

40451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2148.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 40451 is about 201.1243396509. The cubic root of 40451 is about 34.3275720583.

Adding to 40451 its reverse (15404), we get a palindrome (55855).

The spelling of 40451 in words is "forty thousand, four hundred fifty-one".