31906398 has 8 divisors (see below), whose sum is σ = 63812808. Its totient is φ = 10635464.

The previous prime is 31906397. The next prime is 31906417. The reversal of 31906398 is 89360913.

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

31906398 is an admirable number.

It is a super-4 number, since 4×31906398⁴ (a number of 31 digits) contains 4444 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31906393) 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, 2658861 + ... + 2658872.

It is an arithmetic number, because the mean of its divisors is an integer number (7976601).

Almost surely, 2^31906398 is an apocalyptic number.

31906398 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31906398 is a wasteful number, since it uses less digits than its factorization.

31906398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5317738.

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 31906398 is about 5648.5748645123. The cubic root of 31906398 is about 317.1703582654.

The spelling of 31906398 in words is "thirty-one million, nine hundred six thousand, three hundred ninety-eight".