40749389 has 4 divisors (see below), whose sum is σ = 40815840. Its totient is φ = 40682940.

The previous prime is 40749383. The next prime is 40749413. The reversal of 40749389 is 98394704.

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 40749389 - 2⁸ = 40749133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40749383) 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, 32297 + ... + 33534.

It is an arithmetic number, because the mean of its divisors is an integer number (10203960).

Almost surely, 2^40749389 is an apocalyptic number.

It is an amenable number.

40749389 is a deficient number, since it is larger than the sum of its proper divisors (66451).

40749389 is an equidigital number, since it uses as much as digits as its factorization.

40749389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66450.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 40749389 is about 6383.5248100090. The cubic root of 40749389 is about 344.1177176218.

The spelling of 40749389 in words is "forty million, seven hundred forty-nine thousand, three hundred eighty-nine".