40251240 has 96 divisors (see below), whose sum is σ = 138532680. Its totient is φ = 10100736.

The previous prime is 40251209. The next prime is 40251241. The reversal of 40251240 is 4215204.

40251240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 40220964 + 30276 = 6342^2 + 174^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (40251241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2832 + ... + 9408.

Almost surely, 2^40251240 is an apocalyptic number.

40251240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40251240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69266340).

40251240 is an abundant number, since it is smaller than the sum of its proper divisors (98281440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40251240 is a wasteful number, since it uses less digits than its factorization.

40251240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6611 (or 6604 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 40251240 is about 6344.3864951625. The cubic root of 40251240 is about 342.7097193573.

Adding to 40251240 its reverse (4215204), we get a palindrome (44466444).

The spelling of 40251240 in words is "forty million, two hundred fifty-one thousand, two hundred forty".