399142049 has 8 divisors (see below), whose sum is σ = 409893120. Its totient is φ = 388533600.

The previous prime is 399142033. The next prime is 399142067. The reversal of 399142049 is 940241993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 399142049 - 2⁴ = 399142033 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 399141997 and 399142015.

It is not an unprimeable number, because it can be changed into a prime (399142349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29972 + ... + 41189.

It is an arithmetic number, because the mean of its divisors is an integer number (51236640).

Almost surely, 2^399142049 is an apocalyptic number.

It is an amenable number.

399142049 is a deficient number, since it is larger than the sum of its proper divisors (10751071).

399142049 is an equidigital number, since it uses as much as digits as its factorization.

399142049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71311.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 399142049 is about 19978.5397114003. The cubic root of 399142049 is about 736.2791362298.

The spelling of 399142049 in words is "three hundred ninety-nine million, one hundred forty-two thousand, forty-nine".