31240146 has 48 divisors (see below), whose sum is σ = 73954080. Its totient is φ = 8769600.

The previous prime is 31240129. The next prime is 31240159. The reversal of 31240146 is 64104213.

It is a Harshad number since it is a multiple of its sum of digits (21).

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, 16446 + ... + 18246.

It is an arithmetic number, because the mean of its divisors is an integer number (1540710).

Almost surely, 2^31240146 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31240146, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36977040).

31240146 is an abundant number, since it is smaller than the sum of its proper divisors (42713934).

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

31240146 is a wasteful number, since it uses less digits than its factorization.

31240146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1879 (or 1872 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 31240146 is about 5589.2885057045. The cubic root of 31240146 is about 314.9471516278.

Adding to 31240146 its reverse (64104213), we get a palindrome (95344359).

The spelling of 31240146 in words is "thirty-one million, two hundred forty thousand, one hundred forty-six".