213913928 has 12 divisors (see below), whose sum is σ = 401166195. Its totient is φ = 106936280.

The previous prime is 213913897. The next prime is 213913937. The reversal of 213913928 is 829319312.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 106956964 + 106956964 = 10342^2 + 10342^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=10342.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213913891 and 213913900.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 38783 + ... + 43953.

Almost surely, 2^213913928 is an apocalyptic number.

It is an amenable number.

213913928 is a deficient number, since it is larger than the sum of its proper divisors (187252267).

213913928 is an frugal number, since it uses more digits than its factorization.

213913928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10348 (or 5173 counting only the distinct ones).

The product of its digits is 23328, while the sum is 38.

The square root of 213913928 is about 14625.7966620625. The cubic root of 213913928 is about 598.0622001423.

Multiplying 213913928 by its product of digits (23328), we get a square (4990184112384 = 2233872²).

The spelling of 213913928 in words is "two hundred thirteen million, nine hundred thirteen thousand, nine hundred twenty-eight".