40689321 has 4 divisors (see below), whose sum is σ = 54252432. Its totient is φ = 27126212.

The previous prime is 40689293. The next prime is 40689353. The reversal of 40689321 is 12398604.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40689321 - 2⁵ = 40689289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40689371) 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, 6781551 + ... + 6781556.

It is an arithmetic number, because the mean of its divisors is an integer number (13563108).

Almost surely, 2^40689321 is an apocalyptic number.

It is an amenable number.

40689321 is a deficient number, since it is larger than the sum of its proper divisors (13563111).

40689321 is a wasteful number, since it uses less digits than its factorization.

40689321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13563110.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 40689321 is about 6378.8181507235. The cubic root of 40689321 is about 343.9485483937.

The spelling of 40689321 in words is "forty million, six hundred eighty-nine thousand, three hundred twenty-one".