31325340 has 48 divisors (see below), whose sum is σ = 88276608. Its totient is φ = 8299584.

The previous prime is 31325323. The next prime is 31325351. The reversal of 31325340 is 4352313.

It is a super-2 number, since 2×31325340² = 1962553852231200, which contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 8179 + ... + 11381.

It is an arithmetic number, because the mean of its divisors is an integer number (1839096).

Almost surely, 2^31325340 is an apocalyptic number.

31325340 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31325340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44138304).

31325340 is an abundant number, since it is smaller than the sum of its proper divisors (56951268).

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

31325340 is a wasteful number, since it uses less digits than its factorization.

31325340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3378 (or 3376 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 21.

The square root of 31325340 is about 5596.9045015973. The cubic root of 31325340 is about 315.2331858649.

Adding to 31325340 its reverse (4352313), we get a palindrome (35677653).

The spelling of 31325340 in words is "thirty-one million, three hundred twenty-five thousand, three hundred forty".