40019521 has 2 divisors, whose sum is σ = 40019522. Its totient is φ = 40019520.

The previous prime is 40019509. The next prime is 40019527. The reversal of 40019521 is 12591004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28890625 + 11128896 = 5375^2 + 3336^2 .

It is a cyclic number.

It is not a de Polignac number, because 40019521 - 2⁵ = 40019489 is a prime.

It is a super-2 number, since 2×40019521² = 3203124122138882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40019492 and 40019501.

It is not a weakly prime, because it can be changed into another prime (40019527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20009760 + 20009761.

It is an arithmetic number, because the mean of its divisors is an integer number (20009761).

Almost surely, 2^40019521 is an apocalyptic number.

It is an amenable number.

40019521 is a deficient number, since it is larger than the sum of its proper divisors (1).

40019521 is an equidigital number, since it uses as much as digits as its factorization.

40019521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 40019521 is about 6326.0984026491. The cubic root of 40019521 is about 342.0508143549.

The spelling of 40019521 in words is "forty million, nineteen thousand, five hundred twenty-one".