399819340785 has 32 divisors (see below), whose sum is σ = 643976612352. Its totient is φ = 211815901440.

The previous prime is 399819340757. The next prime is 399819340787. The reversal of 399819340785 is 587043918993.

It is not a de Polignac number, because 399819340785 - 2³⁰ = 398745598961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (399819340787) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8527627 + ... + 8574383.

It is an arithmetic number, because the mean of its divisors is an integer number (20124269136).

Almost surely, 2^399819340785 is an apocalyptic number.

It is an amenable number.

399819340785 is a deficient number, since it is larger than the sum of its proper divisors (244157271567).

399819340785 is a wasteful number, since it uses less digits than its factorization.

399819340785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50553.

The product of its (nonzero) digits is 58786560, while the sum is 66.

The spelling of 399819340785 in words is "three hundred ninety-nine billion, eight hundred nineteen million, three hundred forty thousand, seven hundred eighty-five".