40373821 has 2 divisors, whose sum is σ = 40373822. Its totient is φ = 40373820.

The previous prime is 40373791. The next prime is 40373831. The reversal of 40373821 is 12837304.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33292900 + 7080921 = 5770^2 + 2661^2 .

It is a cyclic number.

It is not a de Polignac number, because 40373821 - 2⁵ = 40373789 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40373821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40373831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20186910 + 20186911.

It is an arithmetic number, because the mean of its divisors is an integer number (20186911).

Almost surely, 2^40373821 is an apocalyptic number.

It is an amenable number.

40373821 is a deficient number, since it is larger than the sum of its proper divisors (1).

40373821 is an equidigital number, since it uses as much as digits as its factorization.

40373821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 40373821 is about 6354.0397386230. The cubic root of 40373821 is about 343.0572624947.

The spelling of 40373821 in words is "forty million, three hundred seventy-three thousand, eight hundred twenty-one".