31439005 has 32 divisors (see below), whose sum is σ = 42674688. Its totient is φ = 22080000.

The previous prime is 31439003. The next prime is 31439029. The reversal of 31439005 is 50093413.

It is not a de Polignac number, because 31439005 - 2¹ = 31439003 is a prime.

It is a super-2 number, since 2×31439005² = 1976822070780050, 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 (31439003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 125130 + ... + 125380.

It is an arithmetic number, because the mean of its divisors is an integer number (1333584).

Almost surely, 2^31439005 is an apocalyptic number.

It is an amenable number.

31439005 is a deficient number, since it is larger than the sum of its proper divisors (11235683).

31439005 is a wasteful number, since it uses less digits than its factorization.

31439005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 31439005 is about 5607.0495806618. The cubic root of 31439005 is about 315.6140035381.

The spelling of 31439005 in words is "thirty-one million, four hundred thirty-nine thousand, five".