40747021 has 4 divisors (see below), whose sum is σ = 46568032. Its totient is φ = 34926012.

The previous prime is 40747019. The next prime is 40747033. The reversal of 40747021 is 12074704.

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 40747021 - 2¹ = 40747019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40747121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2910495 + ... + 2910508.

It is an arithmetic number, because the mean of its divisors is an integer number (11642008).

Almost surely, 2^40747021 is an apocalyptic number.

It is an amenable number.

40747021 is a deficient number, since it is larger than the sum of its proper divisors (5821011).

40747021 is an equidigital number, since it uses as much as digits as its factorization.

40747021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5821010.

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

The square root of 40747021 is about 6383.3393298492. The cubic root of 40747021 is about 344.1110517833. Note that the first 3 decimals are identical.

The spelling of 40747021 in words is "forty million, seven hundred forty-seven thousand, twenty-one".