40031989 has 4 divisors (see below), whose sum is σ = 40109056. Its totient is φ = 39954924.

The previous prime is 40031987. The next prime is 40032023. The reversal of 40031989 is 98913004.

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 40031989 - 2¹ = 40031987 is a prime.

It is a super-2 number, since 2×40031989² = 3205120286592242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40031987) 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, 37749 + ... + 38794.

It is an arithmetic number, because the mean of its divisors is an integer number (10027264).

Almost surely, 2^40031989 is an apocalyptic number.

It is an amenable number.

40031989 is a deficient number, since it is larger than the sum of its proper divisors (77067).

40031989 is an equidigital number, since it uses as much as digits as its factorization.

40031989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77066.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 40031989 is about 6327.0837674240. The cubic root of 40031989 is about 342.0863324108.

The spelling of 40031989 in words is "forty million, thirty-one thousand, nine hundred eighty-nine".