40144251 has 32 divisors (see below), whose sum is σ = 63313920. Its totient is φ = 22150656.

The previous prime is 40144229. The next prime is 40144301. The reversal of 40144251 is 15244104.

It is a happy number.

It is not a de Polignac number, because 40144251 - 2¹⁰ = 40143227 is a prime.

It is a super-2 number, since 2×40144251² = 3223121776702002, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (40144751) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87615 + ... + 88071.

It is an arithmetic number, because the mean of its divisors is an integer number (1978560).

Almost surely, 2^40144251 is an apocalyptic number.

40144251 is a deficient number, since it is larger than the sum of its proper divisors (23169669).

40144251 is a wasteful number, since it uses less digits than its factorization.

40144251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 40144251 is about 6335.9491001743. The cubic root of 40144251 is about 342.4058056988.

Adding to 40144251 its reverse (15244104), we get a palindrome (55388355).

The spelling of 40144251 in words is "forty million, one hundred forty-four thousand, two hundred fifty-one".