31343040 has 84 divisors (see below), whose sum is σ = 107816904. Its totient is φ = 8357376.

The previous prime is 31343023. The next prime is 31343057. The reversal of 31343040 is 4034313.

It is an interprime number because it is at equal distance from previous prime (31343023) and next prime (31343057).

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

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2562 + ... + 8321.

Almost surely, 2^31343040 is an apocalyptic number.

31343040 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31343040 is an abundant number, since it is smaller than the sum of its proper divisors (76473864).

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

31343040 is a wasteful number, since it uses less digits than its factorization.

31343040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10906 (or 10893 counting only the distinct ones).

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

The square root of 31343040 is about 5598.4855094927. The cubic root of 31343040 is about 315.2925475704.

Adding to 31343040 its reverse (4034313), we get a palindrome (35377353).

The spelling of 31343040 in words is "thirty-one million, three hundred forty-three thousand, forty".