40998421 has 2 divisors, whose sum is σ = 40998422. Its totient is φ = 40998420.

The previous prime is 40998403. The next prime is 40998427. The reversal of 40998421 is 12489904.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24147396 + 16851025 = 4914^2 + 4105^2 .

It is a cyclic number.

It is not a de Polignac number, because 40998421 - 2⁵ = 40998389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40998427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20499210 + 20499211.

It is an arithmetic number, because the mean of its divisors is an integer number (20499211).

Almost surely, 2^40998421 is an apocalyptic number.

It is an amenable number.

40998421 is a deficient number, since it is larger than the sum of its proper divisors (1).

40998421 is an equidigital number, since it uses as much as digits as its factorization.

40998421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 40998421 is about 6403.0009370607. Note that the first 3 decimals coincide. The cubic root of 40998421 is about 344.8172973676.

The spelling of 40998421 in words is "forty million, nine hundred ninety-eight thousand, four hundred twenty-one".