31948021 has 8 divisors (see below), whose sum is σ = 36580544. Its totient is φ = 27332640.

The previous prime is 31948013. The next prime is 31948031. The reversal of 31948021 is 12084913.

It is a happy number.

31948021 is a nontrivial binomial coefficient, being equal to C(7994, 2).

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

It is a cyclic number.

It is not a de Polignac number, because 31948021 - 2³ = 31948013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31948001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1 + ... + 7993.

It is an arithmetic number, because the mean of its divisors is an integer number (4572568).

Almost surely, 2^31948021 is an apocalyptic number.

31948021 is the 7993-rd triangular number and also the 3997-th hexagonal number.

31948021 is the 2665-th centered nonagonal number.

It is an amenable number.

31948021 is a deficient number, since it is larger than the sum of its proper divisors (4632523).

31948021 is an equidigital number, since it uses as much as digits as its factorization.

31948021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8571.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 31948021 is about 5652.2580443571. The cubic root of 31948021 is about 317.3082182367.

The spelling of 31948021 in words is "thirty-one million, nine hundred forty-eight thousand, twenty-one".