40689490 has 8 divisors (see below), whose sum is σ = 73241100. Its totient is φ = 16275792.

The previous prime is 40689487. The next prime is 40689491. The reversal of 40689490 is 9498604.

It can be written as a sum of positive squares in 2 ways, for example, as 39955041 + 734449 = 6321^2 + 857^2 .

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

It is not an unprimeable number, because it can be changed into a prime (40689491) 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, 2034465 + ... + 2034484.

Almost surely, 2^40689490 is an apocalyptic number.

40689490 is a deficient number, since it is larger than the sum of its proper divisors (32551610).

40689490 is a wasteful number, since it uses less digits than its factorization.

40689490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4068956.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 40689490 is about 6378.8313976778. The cubic root of 40689490 is about 343.9490245811.

The spelling of 40689490 in words is "forty million, six hundred eighty-nine thousand, four hundred ninety".