40749021 has 16 divisors (see below), whose sum is σ = 60995200. Its totient is φ = 26884224.

The previous prime is 40749001. The next prime is 40749061. The reversal of 40749021 is 12094704.

It is a happy number.

It is not a de Polignac number, because 40749021 - 2⁵ = 40748989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40749001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5161 + ... + 10398.

It is an arithmetic number, because the mean of its divisors is an integer number (3812200).

Almost surely, 2^40749021 is an apocalyptic number.

It is an amenable number.

40749021 is a deficient number, since it is larger than the sum of its proper divisors (20246179).

40749021 is a wasteful number, since it uses less digits than its factorization.

40749021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15665 (or 15659 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 40749021 is about 6383.4959857432. The cubic root of 40749021 is about 344.1166817314.

The spelling of 40749021 in words is "forty million, seven hundred forty-nine thousand, twenty-one".