40640546 has 8 divisors (see below), whose sum is σ = 61156524. Its totient is φ = 20255040.

The previous prime is 40640543. The next prime is 40640569. The reversal of 40640546 is 64504604.

It can be written as a sum of positive squares in 2 ways, for example, as 25391521 + 15249025 = 5039^2 + 3905^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40640543) 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, 31835 + ... + 33086.

Almost surely, 2^40640546 is an apocalyptic number.

40640546 is a deficient number, since it is larger than the sum of its proper divisors (20515978).

40640546 is a wasteful number, since it uses less digits than its factorization.

40640546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65236.

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 40640546 is about 6374.9938039186. The cubic root of 40640546 is about 343.8110610648.

The spelling of 40640546 in words is "forty million, six hundred forty thousand, five hundred forty-six".