40725409 has 2 divisors, whose sum is σ = 40725410. Its totient is φ = 40725408.

The previous prime is 40725403. The next prime is 40725427. The reversal of 40725409 is 90452704.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38254225 + 2471184 = 6185^2 + 1572^2 .

It is a cyclic number.

It is not a de Polignac number, because 40725409 - 2⁹ = 40724897 is a prime.

It is not a weakly prime, because it can be changed into another prime (40725403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20362704 + 20362705.

It is an arithmetic number, because the mean of its divisors is an integer number (20362705).

Almost surely, 2^40725409 is an apocalyptic number.

It is an amenable number.

40725409 is a deficient number, since it is larger than the sum of its proper divisors (1).

40725409 is an equidigital number, since it uses as much as digits as its factorization.

40725409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 40725409 is about 6381.6462609581. The cubic root of 40725409 is about 344.0502028092.

The spelling of 40725409 in words is "forty million, seven hundred twenty-five thousand, four hundred nine".