31738420 has 96 divisors (see below), whose sum is σ = 80510976. Its totient is φ = 10281600.

The previous prime is 31738411. The next prime is 31738433. The reversal of 31738420 is 2483713.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 308089 + ... + 308191.

It is an arithmetic number, because the mean of its divisors is an integer number (838656).

Almost surely, 2^31738420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31738420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40255488).

31738420 is an abundant number, since it is smaller than the sum of its proper divisors (48772556).

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

31738420 is a wasteful number, since it uses less digits than its factorization.

31738420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221 (or 219 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 31738420 is about 5633.6861822434. The cubic root of 31738420 is about 316.6127750703.

The spelling of 31738420 in words is "thirty-one million, seven hundred thirty-eight thousand, four hundred twenty".