206421426 has 16 divisors (see below), whose sum is σ = 458714400. Its totient is φ = 68807124.

The previous prime is 206421419. The next prime is 206421427. The reversal of 206421426 is 624124602.

206421426 is a `hidden beast` number, since 2 + 0 + 642 + 14 + 2 + 6 = 666.

206421426 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×206421426² = 85219610223746952, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 206421426.

It is not an unprimeable number, because it can be changed into a prime (206421427) 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, 1911256 + ... + 1911363.

It is an arithmetic number, because the mean of its divisors is an integer number (28669650).

Almost surely, 2^206421426 is an apocalyptic number.

206421426 is an abundant number, since it is smaller than the sum of its proper divisors (252292974).

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

206421426 is a wasteful number, since it uses less digits than its factorization.

206421426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3822630 (or 3822624 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 206421426 is about 14367.3736639652. The cubic root of 206421426 is about 590.9965214050.

The spelling of 206421426 in words is "two hundred six million, four hundred twenty-one thousand, four hundred twenty-six".