213405139 has 4 divisors (see below), whose sum is σ = 213554880. Its totient is φ = 213255400.

The previous prime is 213405121. The next prime is 213405161. The reversal of 213405139 is 931504312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 213405139 - 2¹⁵ = 213372371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213405119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72712 + ... + 75589.

It is an arithmetic number, because the mean of its divisors is an integer number (53388720).

Almost surely, 2^213405139 is an apocalyptic number.

213405139 is a deficient number, since it is larger than the sum of its proper divisors (149741).

213405139 is a wasteful number, since it uses less digits than its factorization.

213405139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149740.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 213405139 is about 14608.3927589588. The cubic root of 213405139 is about 597.5876649906.

The spelling of 213405139 in words is "two hundred thirteen million, four hundred five thousand, one hundred thirty-nine".