40427521 has 2 divisors, whose sum is σ = 40427522. Its totient is φ = 40427520.

The previous prime is 40427507. The next prime is 40427533. The reversal of 40427521 is 12572404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23658496 + 16769025 = 4864^2 + 4095^2 .

It is a cyclic number.

It is not a de Polignac number, because 40427521 - 2²⁵ = 6873089 is a prime.

It is a super-3 number, since 3×40427521³ (a number of 24 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (40427501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20213760 + 20213761.

It is an arithmetic number, because the mean of its divisors is an integer number (20213761).

It is a Proth number, since it is equal to 4935 ⋅ 2¹³ + 1 and 4935 < 2¹³.

Almost surely, 2^40427521 is an apocalyptic number.

It is an amenable number.

40427521 is a deficient number, since it is larger than the sum of its proper divisors (1).

40427521 is an equidigital number, since it uses as much as digits as its factorization.

40427521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 40427521 is about 6358.2639926320. The cubic root of 40427521 is about 343.2092918129.

Adding to 40427521 its reverse (12572404), we get a palindrome (52999925).

The spelling of 40427521 in words is "forty million, four hundred twenty-seven thousand, five hundred twenty-one".