647442403 has 4 divisors (see below), whose sum is σ = 650129128. Its totient is φ = 644755680.

The previous prime is 647442379. The next prime is 647442407. The reversal of 647442403 is 304244746.

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 647442403 - 2¹³ = 647434211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647442407) 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, 1343001 + ... + 1343482.

It is an arithmetic number, because the mean of its divisors is an integer number (162532282).

Almost surely, 2^647442403 is an apocalyptic number.

647442403 is a deficient number, since it is larger than the sum of its proper divisors (2686725).

647442403 is a wasteful number, since it uses less digits than its factorization.

647442403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2686724.

The product of its (nonzero) digits is 64512, while the sum is 34.

The square root of 647442403 is about 25444.8895261897. The cubic root of 647442403 is about 865.1014629219.

The spelling of 647442403 in words is "six hundred forty-seven million, four hundred forty-two thousand, four hundred three".