290206385 has 16 divisors (see below), whose sum is σ = 398378496. Its totient is φ = 198808128.

The previous prime is 290206381. The next prime is 290206453. The reversal of 290206385 is 583602092.

It is a cyclic number.

It is not a de Polignac number, because 290206385 - 2² = 290206381 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (290206381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39944 + ... + 46646.

It is an arithmetic number, because the mean of its divisors is an integer number (24898656).

Almost surely, 2^290206385 is an apocalyptic number.

It is an amenable number.

290206385 is a deficient number, since it is larger than the sum of its proper divisors (108172111).

290206385 is a wasteful number, since it uses less digits than its factorization.

290206385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7952.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 290206385 is about 17035.4449604347. Note that the first 3 decimals coincide. The cubic root of 290206385 is about 662.0675787384.

The spelling of 290206385 in words is "two hundred ninety million, two hundred six thousand, three hundred eighty-five".