208997972 has 6 divisors (see below), whose sum is σ = 365746458. Its totient is φ = 104498984.

The previous prime is 208997969. The next prime is 208997977. The reversal of 208997972 is 279799802.

It can be written as a sum of positive squares in only one way, i.e., 207475216 + 1522756 = 14404^2 + 1234^2 .

It is a super-2 number, since 2×208997972² = 87360304600225568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208997977) 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 as a sum of consecutive naturals, namely, 26124743 + ... + 26124750.

It is an arithmetic number, because the mean of its divisors is an integer number (60957743).

Almost surely, 2^208997972 is an apocalyptic number.

It is an amenable number.

208997972 is a deficient number, since it is larger than the sum of its proper divisors (156748486).

208997972 is a wasteful number, since it uses less digits than its factorization.

208997972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52249497 (or 52249495 counting only the distinct ones).

The product of its (nonzero) digits is 1143072, while the sum is 53.

The square root of 208997972 is about 14456.7621547842. The cubic root of 208997972 is about 593.4452945586.

The spelling of 208997972 in words is "two hundred eight million, nine hundred ninety-seven thousand, nine hundred seventy-two".