312220404 has 18 divisors (see below), whose sum is σ = 789223890. Its totient is φ = 104073456.

The previous prime is 312220379. The next prime is 312220417. The reversal of 312220404 is 404022213.

It can be written as a sum of positive squares in only one way, i.e., 310112100 + 2108304 = 17610^2 + 1452^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4336359 + ... + 4336430.

Almost surely, 2^312220404 is an apocalyptic number.

It is an amenable number.

312220404 is an abundant number, since it is smaller than the sum of its proper divisors (477003486).

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

312220404 is a wasteful number, since it uses less digits than its factorization.

312220404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8672799 (or 8672794 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 312220404 is about 17669.7595908943. The cubic root of 312220404 is about 678.4019596784.

Adding to 312220404 its reverse (404022213), we get a palindrome (716242617).

The spelling of 312220404 in words is "three hundred twelve million, two hundred twenty thousand, four hundred four".