389606261 has 4 divisors (see below), whose sum is σ = 425025024. Its totient is φ = 354187500.

The previous prime is 389606257. The next prime is 389606279. The reversal of 389606261 is 162606983.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 389606261 - 2² = 389606257 is a prime.

It is a super-2 number, since 2×389606261² = 303586077220800242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389606201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17709365 + ... + 17709386.

It is an arithmetic number, because the mean of its divisors is an integer number (106256256).

Almost surely, 2^389606261 is an apocalyptic number.

It is an amenable number.

389606261 is a deficient number, since it is larger than the sum of its proper divisors (35418763).

389606261 is a wasteful number, since it uses less digits than its factorization.

389606261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35418762.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 389606261 is about 19738.4462661072. The cubic root of 389606261 is about 730.3684016536.

The spelling of 389606261 in words is "three hundred eighty-nine million, six hundred six thousand, two hundred sixty-one".