31400043 has 4 divisors (see below), whose sum is σ = 41866728. Its totient is φ = 20933360.

The previous prime is 31400029. The next prime is 31400053. The reversal of 31400043 is 34000413.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31400043 - 2⁸ = 31399787 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31399995 and 31400031.

It is not an unprimeable number, because it can be changed into a prime (31400023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5233338 + ... + 5233343.

It is an arithmetic number, because the mean of its divisors is an integer number (10466682).

Almost surely, 2^31400043 is an apocalyptic number.

31400043 is a deficient number, since it is larger than the sum of its proper divisors (10466685).

31400043 is a wasteful number, since it uses less digits than its factorization.

31400043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10466684.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 31400043 is about 5603.5741272870. The cubic root of 31400043 is about 315.4835706980.

Adding to 31400043 its reverse (34000413), we get a palindrome (65400456).

The spelling of 31400043 in words is "thirty-one million, four hundred thousand, forty-three".