31398471 has 36 divisors (see below), whose sum is σ = 50618568. Its totient is φ = 18633888.

The previous prime is 31398467. The next prime is 31398481. The reversal of 31398471 is 17489313.

It is a happy number.

It is not a de Polignac number, because 31398471 - 2² = 31398467 is a prime.

It is a super-3 number, since 3×31398471³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31398481) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 397410 + ... + 397488.

Almost surely, 2^31398471 is an apocalyptic number.

31398471 is a deficient number, since it is larger than the sum of its proper divisors (19220097).

31398471 is a wasteful number, since it uses less digits than its factorization.

31398471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220 (or 138 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 31398471 is about 5603.4338579125. The cubic root of 31398471 is about 315.4783058597.

The spelling of 31398471 in words is "thirty-one million, three hundred ninety-eight thousand, four hundred seventy-one".