212673730 has 16 divisors (see below), whose sum is σ = 383444280. Its totient is φ = 84929152.

The previous prime is 212673697. The next prime is 212673737. The reversal of 212673730 is 37376212.

It can be written as a sum of positive squares in 4 ways, for example, as 120494529 + 92179201 = 10977^2 + 9601^2 .

It is a super-2 number, since 2×212673730² = 90460230864225800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 212673692 and 212673701.

It is not an unprimeable number, because it can be changed into a prime (212673737) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11065 + ... + 23404.

Almost surely, 2^212673730 is an apocalyptic number.

212673730 is a deficient number, since it is larger than the sum of its proper divisors (170770550).

212673730 is a wasteful number, since it uses less digits than its factorization.

212673730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35093.

The product of its (nonzero) digits is 10584, while the sum is 31.

The square root of 212673730 is about 14583.3374095232. The cubic root of 212673730 is about 596.9041742819.

The spelling of 212673730 in words is "two hundred twelve million, six hundred seventy-three thousand, seven hundred thirty".