312040405 has 16 divisors (see below), whose sum is σ = 378826560. Its totient is φ = 246730752.

The previous prime is 312040403. The next prime is 312040411. The reversal of 312040405 is 504040213.

It is a cyclic number.

It is not a de Polignac number, because 312040405 - 2¹ = 312040403 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312040403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 177742 + ... + 179488.

It is an arithmetic number, because the mean of its divisors is an integer number (23676660).

Almost surely, 2^312040405 is an apocalyptic number.

It is an amenable number.

312040405 is a deficient number, since it is larger than the sum of its proper divisors (66786155).

312040405 is a wasteful number, since it uses less digits than its factorization.

312040405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2148.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 312040405 is about 17664.6654369677. The cubic root of 312040405 is about 678.2715655225.

Adding to 312040405 its reverse (504040213), we get a palindrome (816080618).

It can be divided in two parts, 312040 and 405, that added together give a triangular number (312445 = T₇₉₀).

The spelling of 312040405 in words is "three hundred twelve million, forty thousand, four hundred five".