40989639 has 8 divisors (see below), whose sum is σ = 54682992. Its totient is φ = 27311360.

The previous prime is 40989587. The next prime is 40989643. The reversal of 40989639 is 93698904.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 40989639 - 2¹² = 40985543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40989679) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6877 + ... + 11369.

It is an arithmetic number, because the mean of its divisors is an integer number (6835374).

Almost surely, 2^40989639 is an apocalyptic number.

40989639 is a deficient number, since it is larger than the sum of its proper divisors (13693353).

40989639 is a wasteful number, since it uses less digits than its factorization.

40989639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7537.

The product of its (nonzero) digits is 419904, while the sum is 48.

The square root of 40989639 is about 6402.3151281392. The cubic root of 40989639 is about 344.7926752669.

The spelling of 40989639 in words is "forty million, nine hundred eighty-nine thousand, six hundred thirty-nine".