40221749 has 4 divisors (see below), whose sum is σ = 40235436. Its totient is φ = 40208064.

The previous prime is 40221743. The next prime is 40221757. The reversal of 40221749 is 94712204.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 29866225 + 10355524 = 5465^2 + 3218^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40221749 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40221743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 434 + ... + 8979.

It is an arithmetic number, because the mean of its divisors is an integer number (10058859).

Almost surely, 2^40221749 is an apocalyptic number.

It is an amenable number.

40221749 is a deficient number, since it is larger than the sum of its proper divisors (13687).

40221749 is an equidigital number, since it uses as much as digits as its factorization.

40221749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13686.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 40221749 is about 6342.0618886920. The cubic root of 40221749 is about 342.6260008459.

The spelling of 40221749 in words is "forty million, two hundred twenty-one thousand, seven hundred forty-nine".