40025021 has 4 divisors (see below), whose sum is σ = 42379452. Its totient is φ = 37670592.

The previous prime is 40024993. The next prime is 40025023. The reversal of 40025021 is 12052004.

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

It can be written as a sum of positive squares in 2 ways, for example, as 27144100 + 12880921 = 5210^2 + 3589^2 .

It is a cyclic number.

It is not a de Polignac number, because 40025021 - 2¹⁴ = 40008637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 40024987 and 40025005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40025023) 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, 1177190 + ... + 1177223.

It is an arithmetic number, because the mean of its divisors is an integer number (10594863).

Almost surely, 2^40025021 is an apocalyptic number.

It is an amenable number.

40025021 is a deficient number, since it is larger than the sum of its proper divisors (2354431).

40025021 is a wasteful number, since it uses less digits than its factorization.

40025021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2354430.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 40025021 is about 6326.5330948316. The cubic root of 40025021 is about 342.0664833190.

Adding to 40025021 its reverse (12052004), we get a palindrome (52077025).

The spelling of 40025021 in words is "forty million, twenty-five thousand, twenty-one".