40706521 has 4 divisors (see below), whose sum is σ = 40739344. Its totient is φ = 40673700.

The previous prime is 40706461. The next prime is 40706557. The reversal of 40706521 is 12560704.

40706521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40706521 - 2¹¹ = 40704473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40706221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14475 + ... + 17056.

It is an arithmetic number, because the mean of its divisors is an integer number (10184836).

Almost surely, 2^40706521 is an apocalyptic number.

It is an amenable number.

40706521 is a deficient number, since it is larger than the sum of its proper divisors (32823).

40706521 is a wasteful number, since it uses less digits than its factorization.

40706521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32822.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 40706521 is about 6380.1662204052. The cubic root of 40706521 is about 343.9970056752.

The spelling of 40706521 in words is "forty million, seven hundred six thousand, five hundred twenty-one".