31479638 has 4 divisors (see below), whose sum is σ = 47219460. Its totient is φ = 15739818.

The previous prime is 31479619. The next prime is 31479647. The reversal of 31479638 is 83697413.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83697413 = 19 ⋅4405127.

It is a super-2 number, since 2×31479638² = 1981935217222088, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31479595 and 31479604.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7869908 + ... + 7869911.

It is an arithmetic number, because the mean of its divisors is an integer number (11804865).

Almost surely, 2^31479638 is an apocalyptic number.

31479638 is a deficient number, since it is larger than the sum of its proper divisors (15739822).

31479638 is a wasteful number, since it uses less digits than its factorization.

31479638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15739821.

The product of its digits is 108864, while the sum is 41.

The square root of 31479638 is about 5610.6717957835. The cubic root of 31479638 is about 315.7499156307.

The spelling of 31479638 in words is "thirty-one million, four hundred seventy-nine thousand, six hundred thirty-eight".