213949539 has 16 divisors (see below), whose sum is σ = 335607840. Its totient is φ = 134242560.

The previous prime is 213949513. The next prime is 213949591. The reversal of 213949539 is 935949312.

213949539 is a `hidden beast` number, since 21 + 3 + 94 + 9 + 539 = 666.

It is not a de Polignac number, because 213949539 - 2⁸ = 213949283 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213949494 and 213949503.

It is not an unprimeable number, because it can be changed into a prime (213949039) 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, 232602 + ... + 233519.

It is an arithmetic number, because the mean of its divisors is an integer number (20975490).

Almost surely, 2^213949539 is an apocalyptic number.

213949539 is a deficient number, since it is larger than the sum of its proper divisors (121658301).

213949539 is a wasteful number, since it uses less digits than its factorization.

213949539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466147 (or 466141 counting only the distinct ones).

The product of its digits is 262440, while the sum is 45.

The square root of 213949539 is about 14627.0140151707. The cubic root of 213949539 is about 598.0953854698.

The spelling of 213949539 in words is "two hundred thirteen million, nine hundred forty-nine thousand, five hundred thirty-nine".