635972 has 6 divisors (see below), whose sum is σ = 1112958. Its totient is φ = 317984.

The previous prime is 635969. The next prime is 635977. The reversal of 635972 is 279536.

It can be written as a sum of positive squares in only one way, i.e., 614656 + 21316 = 784^2 + 146^2 .

It is not an unprimeable number, because it can be changed into a prime (635977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79493 + ... + 79500.

It is an arithmetic number, because the mean of its divisors is an integer number (185493).

2⁶³⁵⁹⁷² is an apocalyptic number.

It is an amenable number.

635972 is a deficient number, since it is larger than the sum of its proper divisors (476986).

635972 is a wasteful number, since it uses less digits than its factorization.

635972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158997 (or 158995 counting only the distinct ones).

The product of its digits is 11340, while the sum is 32.

The square root of 635972 is about 797.4785263567. The cubic root of 635972 is about 85.9962140032.

The spelling of 635972 in words is "six hundred thirty-five thousand, nine hundred seventy-two".