207621997 has 8 divisors (see below), whose sum is σ = 226616832. Its totient is φ = 188647200.

The previous prime is 207621961. The next prime is 207622007. The reversal of 207621997 is 799126702.

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

It is a cyclic number.

It is not a de Polignac number, because 207621997 - 2¹⁵ = 207589229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (207621907) 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 7 ways as a sum of consecutive naturals, for example, 23988 + ... + 31474.

It is an arithmetic number, because the mean of its divisors is an integer number (28327104).

Almost surely, 2^207621997 is an apocalyptic number.

It is an amenable number.

207621997 is a deficient number, since it is larger than the sum of its proper divisors (18994835).

207621997 is a wasteful number, since it uses less digits than its factorization.

207621997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10019.

The product of its (nonzero) digits is 95256, while the sum is 43.

The square root of 207621997 is about 14409.0942463432. The cubic root of 207621997 is about 592.1400753954.

The spelling of 207621997 in words is "two hundred seven million, six hundred twenty-one thousand, nine hundred ninety-seven".