312138036 has 90 divisors (see below), whose sum is σ = 949261698. Its totient is φ = 89177760.

The previous prime is 312138019. The next prime is 312138053. The reversal of 312138036 is 630831213.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (312138019) and next prime (312138053).

It can be written as a sum of positive squares in only one way, i.e., 272448036 + 39690000 = 16506^2 + 6300^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 6046 + ... + 25706.

Almost surely, 2^312138036 is an apocalyptic number.

312138036 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 312138036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (474630849).

312138036 is an abundant number, since it is smaller than the sum of its proper divisors (637123662).

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

312138036 is a wasteful number, since it uses less digits than its factorization.

312138036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19691 (or 19673 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 312138036 is about 17667.4286753902. The cubic root of 312138036 is about 678.3422972023.

Adding to 312138036 its reverse (630831213), we get a palindrome (942969249).

The spelling of 312138036 in words is "three hundred twelve million, one hundred thirty-eight thousand, thirty-six".