40470721 has 2 divisors, whose sum is σ = 40470722. Its totient is φ = 40470720.

The previous prime is 40470701. The next prime is 40470743. The reversal of 40470721 is 12707404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30636225 + 9834496 = 5535^2 + 3136^2 .

It is a cyclic number.

It is not a de Polignac number, because 40470721 - 2¹³ = 40462529 is a prime.

It is not a weakly prime, because it can be changed into another prime (40470701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20235360 + 20235361.

It is an arithmetic number, because the mean of its divisors is an integer number (20235361).

Almost surely, 2^40470721 is an apocalyptic number.

It is an amenable number.

40470721 is a deficient number, since it is larger than the sum of its proper divisors (1).

40470721 is an equidigital number, since it uses as much as digits as its factorization.

40470721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1568, while the sum is 25.

The square root of 40470721 is about 6361.6602392772. The cubic root of 40470721 is about 343.3314970419.

The spelling of 40470721 in words is "forty million, four hundred seventy thousand, seven hundred twenty-one".