212306004 has 18 divisors (see below), whose sum is σ = 536662490. Its totient is φ = 70768656.

The previous prime is 212305991. The next prime is 212306041. The reversal of 212306004 is 400603212.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 134513604 + 77792400 = 11598^2 + 8820^2 .

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, 2948659 + ... + 2948730.

Almost surely, 2^212306004 is an apocalyptic number.

It is an amenable number.

212306004 is an abundant number, since it is smaller than the sum of its proper divisors (324356486).

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

212306004 is a wasteful number, since it uses less digits than its factorization.

212306004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5897399 (or 5897394 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 212306004 is about 14570.7242098669. The cubic root of 212306004 is about 596.5599477616.

Adding to 212306004 its reverse (400603212), we get a palindrome (612909216).

The spelling of 212306004 in words is "two hundred twelve million, three hundred six thousand, four".