245906 has 4 divisors (see below), whose sum is σ = 368862. Its totient is φ = 122952.

The previous prime is 245899. The next prime is 245909. The reversal of 245906 is 609542.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 609542 = 2 ⋅304771.

It can be written as a sum of positive squares in only one way, i.e., 152881 + 93025 = 391^2 + 305^2 .

It is not an unprimeable number, because it can be changed into a prime (245909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61475 + ... + 61478.

2²⁴⁵⁹⁰⁶ is an apocalyptic number.

245906 is a deficient number, since it is larger than the sum of its proper divisors (122956).

245906 is a wasteful number, since it uses less digits than its factorization.

245906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122955.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 245906 is about 495.8891005053. The cubic root of 245906 is about 62.6502836807.

The spelling of 245906 in words is "two hundred forty-five thousand, nine hundred six".