40292821 has 2 divisors, whose sum is σ = 40292822. Its totient is φ = 40292820.

The previous prime is 40292807. The next prime is 40292867. The reversal of 40292821 is 12829204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25959025 + 14333796 = 5095^2 + 3786^2 .

It is a cyclic number.

It is not a de Polignac number, because 40292821 - 2⁵ = 40292789 is a prime.

It is a super-2 number, since 2×40292821² = 3247022848276082, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 40292821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40292621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20146410 + 20146411.

It is an arithmetic number, because the mean of its divisors is an integer number (20146411).

Almost surely, 2^40292821 is an apocalyptic number.

It is an amenable number.

40292821 is a deficient number, since it is larger than the sum of its proper divisors (1).

40292821 is an equidigital number, since it uses as much as digits as its factorization.

40292821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 40292821 is about 6347.6626406891. The cubic root of 40292821 is about 342.8276892936.

The spelling of 40292821 in words is "forty million, two hundred ninety-two thousand, eight hundred twenty-one".