647434 has 4 divisors (see below), whose sum is σ = 971154. Its totient is φ = 323716.

The previous prime is 647429. The next prime is 647441. The reversal of 647434 is 434746.

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

It can be written as a sum of positive squares in only one way, i.e., 442225 + 205209 = 665^2 + 453^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161857 + ... + 161860.

2⁶⁴⁷⁴³⁴ is an apocalyptic number.

647434 is a deficient number, since it is larger than the sum of its proper divisors (323720).

647434 is a wasteful number, since it uses less digits than its factorization.

647434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323719.

The product of its digits is 8064, while the sum is 28.

The square root of 647434 is about 804.6328355219. The cubic root of 647434 is about 86.5097720257.

It can be divided in two parts, 6474 and 34, that multiplied together give a triangular number (220116 = T₆₆₃).

The spelling of 647434 in words is "six hundred forty-seven thousand, four hundred thirty-four".