40721441 has 2 divisors, whose sum is σ = 40721442. Its totient is φ = 40721440.

The previous prime is 40721399. The next prime is 40721459. The reversal of 40721441 is 14412704.

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., 30481441 + 10240000 = 5521^2 + 3200^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40721441 is a prime.

It is a super-3 number, since 3×40721441³ (a number of 24 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (40721641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20360720 + 20360721.

It is an arithmetic number, because the mean of its divisors is an integer number (20360721).

Almost surely, 2^40721441 is an apocalyptic number.

It is an amenable number.

40721441 is a deficient number, since it is larger than the sum of its proper divisors (1).

40721441 is an equidigital number, since it uses as much as digits as its factorization.

40721441 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 40721441 is about 6381.3353618189. The cubic root of 40721441 is about 344.0390284951.

The spelling of 40721441 in words is "forty million, seven hundred twenty-one thousand, four hundred forty-one".