31400334 has 48 divisors (see below), whose sum is σ = 80271360. Its totient is φ = 8681040.

The previous prime is 31400323. The next prime is 31400399. The reversal of 31400334 is 43300413.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 114 + ... + 7925.

It is an arithmetic number, because the mean of its divisors is an integer number (1672320).

Almost surely, 2^31400334 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31400334, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40135680).

31400334 is an abundant number, since it is smaller than the sum of its proper divisors (48871026).

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

31400334 is a wasteful number, since it uses less digits than its factorization.

31400334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8085 (or 8082 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 31400334 is about 5603.6000927975. The cubic root of 31400334 is about 315.4845452767.

Adding to 31400334 its reverse (43300413), we get a palindrome (74700747).

The spelling of 31400334 in words is "thirty-one million, four hundred thousand, three hundred thirty-four".