213438434 has 48 divisors (see below), whose sum is σ = 385673400. Its totient is φ = 88112640.

The previous prime is 213438427. The next prime is 213438443. The reversal of 213438434 is 434834312.

It can be written as a sum of positive squares in 4 ways, for example, as 213072409 + 366025 = 14597^2 + 605^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 213438434.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 118412 + ... + 120200.

Almost surely, 2^213438434 is an apocalyptic number.

213438434 is a deficient number, since it is larger than the sum of its proper divisors (172234966).

213438434 is a wasteful number, since it uses less digits than its factorization.

213438434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1859 (or 1848 counting only the distinct ones).

The product of its digits is 27648, while the sum is 32.

The square root of 213438434 is about 14609.5322991532. The cubic root of 213438434 is about 597.6187414785.

The spelling of 213438434 in words is "two hundred thirteen million, four hundred thirty-eight thousand, four hundred thirty-four".