31438036 has 24 divisors (see below), whose sum is σ = 63163520. Its totient is φ = 13411872.

The previous prime is 31438013. The next prime is 31438037. The reversal of 31438036 is 63083413.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 31437995 and 31438013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31438037) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3961 + ... + 8863.

Almost surely, 2^31438036 is an apocalyptic number.

It is an amenable number.

31438036 is an abundant number, since it is smaller than the sum of its proper divisors (31725484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31438036 is a wasteful number, since it uses less digits than its factorization.

31438036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5143 (or 5141 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 31438036 is about 5606.9631709153. The cubic root of 31438036 is about 315.6107609300.

The spelling of 31438036 in words is "thirty-one million, four hundred thirty-eight thousand, thirty-six".