206433390 has 16 divisors (see below), whose sum is σ = 495440208. Its totient is φ = 55048896.

The previous prime is 206433377. The next prime is 206433407. The reversal of 206433390 is 93334602.

It is a super-2 number, since 2×206433390² = 85229489013784200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 6881113 = 206433390 / (2 + 0 + 6 + 4 + 3 + 3 + 3 + 9 + 0).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3440527 + ... + 3440586.

It is an arithmetic number, because the mean of its divisors is an integer number (30965013).

Almost surely, 2^206433390 is an apocalyptic number.

206433390 is an abundant number, since it is smaller than the sum of its proper divisors (289006818).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

206433390 is a wasteful number, since it uses less digits than its factorization.

206433390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6881123.

The product of its (nonzero) digits is 11664, while the sum is 30.

The square root of 206433390 is about 14367.7900179534. The cubic root of 206433390 is about 591.0079390598.

Adding to 206433390 its reverse (93334602), we get a palindrome (299767992).

The spelling of 206433390 in words is "two hundred six million, four hundred thirty-three thousand, three hundred ninety".