31340142 has 16 divisors (see below), whose sum is σ = 69644880. Its totient is φ = 10446696.

The previous prime is 31340093. The next prime is 31340143. The reversal of 31340142 is 24104313.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31340143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 290133 + ... + 290240.

It is an arithmetic number, because the mean of its divisors is an integer number (4352805).

Almost surely, 2^31340142 is an apocalyptic number.

31340142 is an abundant number, since it is smaller than the sum of its proper divisors (38304738).

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

31340142 is a wasteful number, since it uses less digits than its factorization.

31340142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580384 (or 580378 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 31340142 is about 5598.2266835133. The cubic root of 31340142 is about 315.2828298790.

Adding to 31340142 its reverse (24104313), we get a palindrome (55444455).

The spelling of 31340142 in words is "thirty-one million, three hundred forty thousand, one hundred forty-two".