40640434 has 8 divisors (see below), whose sum is σ = 61036848. Its totient is φ = 20294820.

The previous prime is 40640417. The next prime is 40640437. The reversal of 40640434 is 43404604.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 40640399 and 40640408.

It is not an unprimeable number, because it can be changed into a prime (40640437) 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, 10632 + ... + 13939.

It is an arithmetic number, because the mean of its divisors is an integer number (7629606).

Almost surely, 2^40640434 is an apocalyptic number.

40640434 is a deficient number, since it is larger than the sum of its proper divisors (20396414).

40640434 is a wasteful number, since it uses less digits than its factorization.

40640434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25400.

The product of its (nonzero) digits is 4608, while the sum is 25.

The square root of 40640434 is about 6374.9850195902. The cubic root of 40640434 is about 343.8107452318.

The spelling of 40640434 in words is "forty million, six hundred forty thousand, four hundred thirty-four".