642974 has 8 divisors (see below), whose sum is σ = 1021248. Its totient is φ = 302560.

The previous prime is 642973. The next prime is 642977. The reversal of 642974 is 479246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a d-powerful number, because it can be written as 6² + 4² + 9³ + 2¹⁹ + 7⁶ + 4⁴ .

It is a self number, because there is not a number n which added to its sum of digits gives 642974.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 642974.

It is not an unprimeable number, because it can be changed into a prime (642973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9422 + ... + 9489.

It is an arithmetic number, because the mean of its divisors is an integer number (127656).

2⁶⁴²⁹⁷⁴ is an apocalyptic number.

642974 is a deficient number, since it is larger than the sum of its proper divisors (378274).

642974 is a wasteful number, since it uses less digits than its factorization.

642974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18930.

The product of its digits is 12096, while the sum is 32.

The square root of 642974 is about 801.8565956579. The cubic root of 642974 is about 86.3106665531.

The spelling of 642974 in words is "six hundred forty-two thousand, nine hundred seventy-four".