245708139 has 16 divisors (see below), whose sum is σ = 338693120. Its totient is φ = 158280480.

The previous prime is 245708131. The next prime is 245708153. The reversal of 245708139 is 931807542.

245708139 = 75² + 76² + ... + 903².

It is not a de Polignac number, because 245708139 - 2³ = 245708131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 245708097 and 245708106.

It is not an unprimeable number, because it can be changed into a prime (245708131) 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, 75504 + ... + 78690.

It is an arithmetic number, because the mean of its divisors is an integer number (21168320).

Almost surely, 2^245708139 is an apocalyptic number.

245708139 is a deficient number, since it is larger than the sum of its proper divisors (92984981).

245708139 is a wasteful number, since it uses less digits than its factorization.

245708139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4050.

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 245708139 is about 15675.0801911824. The cubic root of 245708139 is about 626.3347593853.

The spelling of 245708139 in words is "two hundred forty-five million, seven hundred eight thousand, one hundred thirty-nine".