947649 has 4 divisors (see below), whose sum is σ = 1263536. Its totient is φ = 631764.

The previous prime is 947647. The next prime is 947651. The reversal of 947649 is 946749.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (947647) and next prime (947651).

It is not a de Polignac number, because 947649 - 2¹ = 947647 is a prime.

It is a D-number.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 947649.

It is not an unprimeable number, because it can be changed into a prime (947641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 157939 + ... + 157944.

It is an arithmetic number, because the mean of its divisors is an integer number (315884).

2⁹⁴⁷⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

947649 is a deficient number, since it is larger than the sum of its proper divisors (315887).

947649 is a wasteful number, since it uses less digits than its factorization.

947649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315886.

The product of its digits is 54432, while the sum is 39.

The square root of 947649 is about 973.4726498469. The cubic root of 947649 is about 98.2235974611.

Subtracting from 947649 its reverse (946749), we obtain a square (900 = 30²).

It can be divided in two parts, 947 and 649, that added together give a triangular number (1596 = T₅₆).

The spelling of 947649 in words is "nine hundred forty-seven thousand, six hundred forty-nine".