40304639 has 4 divisors (see below), whose sum is σ = 40612440. Its totient is φ = 39996840.

The previous prime is 40304633. The next prime is 40304647. The reversal of 40304639 is 93640304.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40304639 - 2⁴ = 40304623 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40304633) 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, 153704 + ... + 153965.

It is an arithmetic number, because the mean of its divisors is an integer number (10153110).

Almost surely, 2^40304639 is an apocalyptic number.

40304639 is a deficient number, since it is larger than the sum of its proper divisors (307801).

40304639 is a wasteful number, since it uses less digits than its factorization.

40304639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307800.

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 40304639 is about 6348.5934662727. The cubic root of 40304639 is about 342.8612034655.

The spelling of 40304639 in words is "forty million, three hundred four thousand, six hundred thirty-nine".