399278603 has 4 divisors (see below), whose sum is σ = 400720320. Its totient is φ = 397836888.

The previous prime is 399278599. The next prime is 399278617. The reversal of 399278603 is 306872993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 306872993 = 7 ⋅43838999.

It is a cyclic number.

It is not a de Polignac number, because 399278603 - 2² = 399278599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399278903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 720443 + ... + 720996.

It is an arithmetic number, because the mean of its divisors is an integer number (100180080).

Almost surely, 2^399278603 is an apocalyptic number.

399278603 is a deficient number, since it is larger than the sum of its proper divisors (1441717).

399278603 is a wasteful number, since it uses less digits than its factorization.

399278603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1441716.

The product of its (nonzero) digits is 489888, while the sum is 47.

The square root of 399278603 is about 19981.9569361962. The cubic root of 399278603 is about 736.3630916352.

The spelling of 399278603 in words is "three hundred ninety-nine million, two hundred seventy-eight thousand, six hundred three".