31234340 has 24 divisors (see below), whose sum is σ = 67119360. Its totient is φ = 12202848.

The previous prime is 31234339. The next prime is 31234369. The reversal of 31234340 is 4343213.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17300 + ... + 19019.

It is an arithmetic number, because the mean of its divisors is an integer number (2796640).

Almost surely, 2^31234340 is an apocalyptic number.

It is an amenable number.

31234340 is an abundant number, since it is smaller than the sum of its proper divisors (35885020).

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

31234340 is a wasteful number, since it uses less digits than its factorization.

31234340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36371 (or 36369 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 31234340 is about 5588.7690952481. The cubic root of 31234340 is about 314.9276393795.

Adding to 31234340 its reverse (4343213), we get a palindrome (35577553).

The spelling of 31234340 in words is "thirty-one million, two hundred thirty-four thousand, three hundred forty".