40372821 has 6 divisors (see below), whose sum is σ = 58316310. Its totient is φ = 26915208.

The previous prime is 40372817. The next prime is 40372847. The reversal of 40372821 is 12827304.

It can be written as a sum of positive squares in only one way, i.e., 21762225 + 18610596 = 4665^2 + 4314^2 .

It is not a de Polignac number, because 40372821 - 2² = 40372817 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40372861) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2242926 + ... + 2242943.

It is an arithmetic number, because the mean of its divisors is an integer number (9719385).

Almost surely, 2^40372821 is an apocalyptic number.

It is an amenable number.

40372821 is a deficient number, since it is larger than the sum of its proper divisors (17943489).

40372821 is a wasteful number, since it uses less digits than its factorization.

40372821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4485875 (or 4485872 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 40372821 is about 6353.9610480392. The cubic root of 40372821 is about 343.0544301305.

The spelling of 40372821 in words is "forty million, three hundred seventy-two thousand, eight hundred twenty-one".