31438138 has 8 divisors (see below), whose sum is σ = 47365632. Its totient is φ = 15649596.

The previous prime is 31438133. The next prime is 31438153. The reversal of 31438138 is 83183413.

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

It is a super-3 number, since 3×31438138³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (31438133) 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 3 ways as a sum of consecutive naturals, for example, 34170 + ... + 35077.

It is an arithmetic number, because the mean of its divisors is an integer number (5920704).

Almost surely, 2^31438138 is an apocalyptic number.

31438138 is a deficient number, since it is larger than the sum of its proper divisors (15927494).

31438138 is a wasteful number, since it uses less digits than its factorization.

31438138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69476.

The product of its digits is 6912, while the sum is 31.

The square root of 31438138 is about 5606.9722667408. The cubic root of 31438138 is about 315.6111022603.

The spelling of 31438138 in words is "thirty-one million, four hundred thirty-eight thousand, one hundred thirty-eight".