31420342 has 4 divisors (see below), whose sum is σ = 47130516. Its totient is φ = 15710170.

The previous prime is 31420327. The next prime is 31420343. The reversal of 31420342 is 24302413.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24302413 = 1823 ⋅13331.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31420343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7855084 + ... + 7855087.

It is an arithmetic number, because the mean of its divisors is an integer number (11782629).

Almost surely, 2^31420342 is an apocalyptic number.

31420342 is a deficient number, since it is larger than the sum of its proper divisors (15710174).

31420342 is a wasteful number, since it uses less digits than its factorization.

31420342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15710173.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 31420342 is about 5605.3850893583. The cubic root of 31420342 is about 315.5515389862.

Adding to 31420342 its reverse (24302413), we get a palindrome (55722755).

The spelling of 31420342 in words is "thirty-one million, four hundred twenty thousand, three hundred forty-two".