40025921 has 8 divisors (see below), whose sum is σ = 43262184. Its totient is φ = 36812160.

The previous prime is 40025899. The next prime is 40025933. The reversal of 40025921 is 12952004.

40025921 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 4682896 + 35343025 = 2164^2 + 5945^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40025921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40025941) 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 7 ways as a sum of consecutive naturals, for example, 1826 + ... + 9131.

It is an arithmetic number, because the mean of its divisors is an integer number (5407773).

Almost surely, 2^40025921 is an apocalyptic number.

40025921 is the 3653-rd octagonal number.

It is an amenable number.

40025921 is a deficient number, since it is larger than the sum of its proper divisors (3236263).

40025921 is a wasteful number, since it uses less digits than its factorization.

40025921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11251.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 40025921 is about 6326.6042234361. The cubic root of 40025921 is about 342.0690471946.

Adding to 40025921 its reverse (12952004), we get a palindrome (52977925).

It can be divided in two parts, 400 and 25921, that multiplied together give a square (10368400 = 3220²).

The spelling of 40025921 in words is "forty million, twenty-five thousand, nine hundred twenty-one".