207672421 has 18 divisors (see below), whose sum is σ = 234200498. Its totient is φ = 184008000.

The previous prime is 207672403. The next prime is 207672431. The reversal of 207672421 is 124276702.

It can be written as a sum of positive squares in 3 ways, for example, as 3496900 + 204175521 = 1870^2 + 14289^2 .

It is not a de Polignac number, because 207672421 - 2⁷ = 207672293 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 (207672401) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 202891 + ... + 203911.

Almost surely, 2^207672421 is an apocalyptic number.

It is an amenable number.

207672421 is a deficient number, since it is larger than the sum of its proper divisors (26528077).

207672421 is a wasteful number, since it uses less digits than its factorization.

207672421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1125 (or 1073 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 207672421 is about 14410.8438684208. The cubic root of 207672421 is about 592.1880081045.

The spelling of 207672421 in words is "two hundred seven million, six hundred seventy-two thousand, four hundred twenty-one".