31402143 has 6 divisors (see below), whose sum is σ = 45358664. Its totient is φ = 20934756.

The previous prime is 31402139. The next prime is 31402171. The reversal of 31402143 is 34120413.

It is not a de Polignac number, because 31402143 - 2² = 31402139 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31402103) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1744555 + ... + 1744572.

Almost surely, 2^31402143 is an apocalyptic number.

31402143 is a deficient number, since it is larger than the sum of its proper divisors (13956521).

31402143 is a wasteful number, since it uses less digits than its factorization.

31402143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3489133 (or 3489130 counting only the distinct ones).

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

The square root of 31402143 is about 5603.7615045610. The cubic root of 31402143 is about 315.4906036048.

Adding to 31402143 its reverse (34120413), we get a palindrome (65522556).

The spelling of 31402143 in words is "thirty-one million, four hundred two thousand, one hundred forty-three".