31380436 has 24 divisors (see below), whose sum is σ = 60154920. Its totient is φ = 14257152.

The previous prime is 31380431. The next prime is 31380451. The reversal of 31380436 is 63408313.

It can be written as a sum of positive squares in 4 ways, for example, as 13690000 + 17690436 = 3700^2 + 4206^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31380431) 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, 5985 + ... + 9928.

It is an arithmetic number, because the mean of its divisors is an integer number (2506455).

Almost surely, 2^31380436 is an apocalyptic number.

It is an amenable number.

31380436 is a deficient number, since it is larger than the sum of its proper divisors (28774484).

31380436 is a wasteful number, since it uses less digits than its factorization.

31380436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15963 (or 15961 counting only the distinct ones).

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

The square root of 31380436 is about 5601.8243456931. The cubic root of 31380436 is about 315.4178916551.

Adding to 31380436 its reverse (63408313), we get a palindrome (94788749).

The spelling of 31380436 in words is "thirty-one million, three hundred eighty thousand, four hundred thirty-six".