40251040 has 48 divisors (see below), whose sum is σ = 95650632. Its totient is φ = 16006144.

The previous prime is 40251031. The next prime is 40251041. The reversal of 40251040 is 4015204.

It can be written as a sum of positive squares in 4 ways, for example, as 40094224 + 156816 = 6332^2 + 396^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (40251041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30882 + ... + 32158.

Almost surely, 2^40251040 is an apocalyptic number.

40251040 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 40251040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47825316).

40251040 is an abundant number, since it is smaller than the sum of its proper divisors (55399592).

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

40251040 is a wasteful number, since it uses less digits than its factorization.

40251040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1489 (or 1481 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 40251040 is about 6344.3707331776. The cubic root of 40251040 is about 342.7091517387.

Adding to 40251040 its reverse (4015204), we get a palindrome (44266244).

The spelling of 40251040 in words is "forty million, two hundred fifty-one thousand, forty".