398940109783 has 4 divisors (see below), whose sum is σ = 398942130040. Its totient is φ = 398938089528.

The previous prime is 398940109781. The next prime is 398940109849. The reversal of 398940109783 is 387901049893.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 398940109783 - 2¹ = 398940109781 is a prime.

It is a super-2 number, since 2×398940109783² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398940109781) 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, 677388 + ... + 1121041.

It is an arithmetic number, because the mean of its divisors is an integer number (99735532510).

Almost surely, 2^398940109783 is an apocalyptic number.

398940109783 is a deficient number, since it is larger than the sum of its proper divisors (2020257).

398940109783 is a wasteful number, since it uses less digits than its factorization.

398940109783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2020256.

The product of its (nonzero) digits is 11757312, while the sum is 61.

The spelling of 398940109783 in words is "three hundred ninety-eight billion, nine hundred forty million, one hundred nine thousand, seven hundred eighty-three".