40251 has 4 divisors (see below), whose sum is σ = 53672. Its totient is φ = 26832.

The previous prime is 40241. The next prime is 40253. The reversal of 40251 is 15204.

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

It is not a de Polignac number, because 40251 - 2⁷ = 40123 is a prime.

It is a D-number.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 40251.

It is not an unprimeable number, because it can be changed into a prime (40253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6706 + ... + 6711.

It is an arithmetic number, because the mean of its divisors is an integer number (13418).

2⁴⁰²⁵¹ is an apocalyptic number.

40251 is a deficient number, since it is larger than the sum of its proper divisors (13421).

40251 is a wasteful number, since it uses less digits than its factorization.

40251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13420.

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 40251 is about 200.6265186858. The cubic root of 40251 is about 34.2709038215.

Adding to 40251 its reverse (15204), we get a palindrome (55455).

It can be divided in two parts, 402 and 51, that multiplied together give a palindrome (20502).

The spelling of 40251 in words is "forty thousand, two hundred fifty-one".