31423400 has 48 divisors (see below), whose sum is σ = 74325600. Its totient is φ = 12351680.

The previous prime is 31423391. The next prime is 31423421. The reversal of 31423400 is 432413.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10469 + ... + 13131.

It is an arithmetic number, because the mean of its divisors is an integer number (1548450).

Almost surely, 2^31423400 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 31423400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37162800).

31423400 is an abundant number, since it is smaller than the sum of its proper divisors (42902200).

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

31423400 is a wasteful number, since it uses less digits than its factorization.

31423400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2738 (or 2729 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 31423400 is about 5605.6578561307. The cubic root of 31423400 is about 315.5617757229.

Adding to 31423400 its reverse (432413), we get a palindrome (31855813).

The spelling of 31423400 in words is "thirty-one million, four hundred twenty-three thousand, four hundred".