238997405 has 16 divisors (see below), whose sum is σ = 299348784. Its totient is φ = 183006720.

The previous prime is 238997309. The next prime is 238997417. The reversal of 238997405 is 504799832.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 6160324 + 232837081 = 2482^2 + 15259^2 .

It is not a de Polignac number, because 238997405 - 2¹⁸ = 238735261 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 238997405.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134 + ... + 21863.

It is an arithmetic number, because the mean of its divisors is an integer number (18709299).

Almost surely, 2^238997405 is an apocalyptic number.

It is an amenable number.

238997405 is a deficient number, since it is larger than the sum of its proper divisors (60351379).

238997405 is a wasteful number, since it uses less digits than its factorization.

238997405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22096.

The product of its (nonzero) digits is 544320, while the sum is 47.

The square root of 238997405 is about 15459.5409052145. The cubic root of 238997405 is about 620.5799334413.

The spelling of 238997405 in words is "two hundred thirty-eight million, nine hundred ninety-seven thousand, four hundred five".