213928905 has 16 divisors (see below), whose sum is σ = 342526464. Its totient is φ = 114015360.

The previous prime is 213928889. The next prime is 213928921. The reversal of 213928905 is 509829312.

It is an interprime number because it is at equal distance from previous prime (213928889) and next prime (213928921).

It is not a de Polignac number, because 213928905 - 2⁴ = 213928889 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21672 + ... + 29958.

It is an arithmetic number, because the mean of its divisors is an integer number (21407904).

Almost surely, 2^213928905 is an apocalyptic number.

It is an amenable number.

213928905 is a deficient number, since it is larger than the sum of its proper divisors (128597559).

213928905 is a wasteful number, since it uses less digits than its factorization.

213928905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10016.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 213928905 is about 14626.3086593987. The cubic root of 213928905 is about 598.0761574204.

The spelling of 213928905 in words is "two hundred thirteen million, nine hundred twenty-eight thousand, nine hundred five".