642084479 has 2 divisors, whose sum is σ = 642084480. Its totient is φ = 642084478.

The previous prime is 642084467. The next prime is 642084511. The reversal of 642084479 is 974480246.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642084479 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642084409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321042239 + 321042240.

It is an arithmetic number, because the mean of its divisors is an integer number (321042240).

Almost surely, 2^642084479 is an apocalyptic number.

642084479 is a deficient number, since it is larger than the sum of its proper divisors (1).

642084479 is an equidigital number, since it uses as much as digits as its factorization.

642084479 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 387072, while the sum is 44.

The square root of 642084479 is about 25339.3859238933. The cubic root of 642084479 is about 862.7084608214.

The spelling of 642084479 in words is "six hundred forty-two million, eighty-four thousand, four hundred seventy-nine".