31438225 has 36 divisors (see below), whose sum is σ = 48288576. Its totient is φ = 19880640.

The previous prime is 31438223. The next prime is 31438229. The reversal of 31438225 is 52283413.

It is not a de Polignac number, because 31438225 - 2¹ = 31438223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31438193 and 31438202.

It is not an unprimeable number, because it can be changed into a prime (31438223) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 29044 + ... + 30106.

Almost surely, 2^31438225 is an apocalyptic number.

31438225 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

31438225 is a deficient number, since it is larger than the sum of its proper divisors (16850351).

31438225 is a wasteful number, since it uses less digits than its factorization.

31438225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1106 (or 1088 counting only the distinct ones).

The product of its digits is 5760, while the sum is 28.

The square root of 31438225 is about 5606.9800249332. The cubic root of 31438225 is about 315.6113933944.

The spelling of 31438225 in words is "thirty-one million, four hundred thirty-eight thousand, two hundred twenty-five".