212988645 has 48 divisors (see below), whose sum is σ = 384052032. Its totient is φ = 109105920.

The previous prime is 212988619. The next prime is 212988647. The reversal of 212988645 is 546889212.

It is not a de Polignac number, because 212988645 - 2⁹ = 212988133 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 212988645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212988647) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 122754 + ... + 124476.

It is an arithmetic number, because the mean of its divisors is an integer number (8001084).

Almost surely, 2^212988645 is an apocalyptic number.

It is an amenable number.

212988645 is a deficient number, since it is larger than the sum of its proper divisors (171063387).

212988645 is a wasteful number, since it uses less digits than its factorization.

212988645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1842 (or 1839 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 212988645 is about 14594.1304982517. The cubic root of 212988645 is about 597.1986494135.

The spelling of 212988645 in words is "two hundred twelve million, nine hundred eighty-eight thousand, six hundred forty-five".