205151438 has 4 divisors (see below), whose sum is σ = 307727160. Its totient is φ = 102575718.

The previous prime is 205151431. The next prime is 205151489. The reversal of 205151438 is 834151502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 834151502 = 2 ⋅417075751.

It is a super-2 number, since 2×205151438² = 84174225026935688, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 205151438.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205151431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51287858 + ... + 51287861.

It is an arithmetic number, because the mean of its divisors is an integer number (76931790).

Almost surely, 2^205151438 is an apocalyptic number.

205151438 is a deficient number, since it is larger than the sum of its proper divisors (102575722).

205151438 is a wasteful number, since it uses less digits than its factorization.

205151438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102575721.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 205151438 is about 14323.1085313210. The cubic root of 205151438 is about 589.7820108218.

The spelling of 205151438 in words is "two hundred five million, one hundred fifty-one thousand, four hundred thirty-eight".