31386340 has 12 divisors (see below), whose sum is σ = 65911356. Its totient is φ = 12554528.

The previous prime is 31386337. The next prime is 31386343. The reversal of 31386340 is 4368313.

It is an interprime number because it is at equal distance from previous prime (31386337) and next prime (31386343).

It can be written as a sum of positive squares in 2 ways, for example, as 4946176 + 26440164 = 2224^2 + 5142^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31386299 and 31386308.

It is not an unprimeable number, because it can be changed into a prime (31386343) 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, 784639 + ... + 784678.

It is an arithmetic number, because the mean of its divisors is an integer number (5492613).

Almost surely, 2^31386340 is an apocalyptic number.

It is an amenable number.

31386340 is an abundant number, since it is smaller than the sum of its proper divisors (34525016).

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

31386340 is a wasteful number, since it uses less digits than its factorization.

31386340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1569326 (or 1569324 counting only the distinct ones).

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

The square root of 31386340 is about 5602.3512920916. The cubic root of 31386340 is about 315.4376716060.

The spelling of 31386340 in words is "thirty-one million, three hundred eighty-six thousand, three hundred forty".