31403 has 4 divisors (see below), whose sum is σ = 32448. Its totient is φ = 30360.

The previous prime is 31397. The next prime is 31469. The reversal of 31403 is 30413.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30413 = 17 ⋅1789.

It is a cyclic number.

It is not a de Polignac number, because 31403 - 2⁴ = 31387 is a prime.

It is a super-2 number, since 2×31403² = 1972296818, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a nialpdrome in base 14.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 31403.

It is not an unprimeable number, because it can be changed into a prime (30403) 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, 476 + ... + 537.

It is an arithmetic number, because the mean of its divisors is an integer number (8112).

2³¹⁴⁰³ is an apocalyptic number.

31403 is a deficient number, since it is larger than the sum of its proper divisors (1045).

31403 is a wasteful number, since it uses less digits than its factorization.

31403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1044.

The product of its (nonzero) digits is 36, while the sum is 11.

The square root of 31403 is about 177.2089162542. The cubic root of 31403 is about 31.5493473611.

Adding to 31403 its reverse (30413), we get a palindrome (61816).

Subtracting from 31403 its reverse (30413), we obtain a triangular number (990 = T₄₄).

It can be divided in two parts, 31 and 403, that added together give a palindrome (434).

The spelling of 31403 in words is "thirty-one thousand, four hundred three".