3999147 has 8 divisors (see below), whose sum is σ = 5352960. Its totient is φ = 2655720.

The previous prime is 3999143. The next prime is 3999161. The reversal of 3999147 is 7419993.

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

It is not a de Polignac number, because 3999147 - 2² = 3999143 is a prime.

3999147 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 3999099 and 3999108.

It is not an unprimeable number, because it can be changed into a prime (3999143) 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, 1647 + ... + 3272.

It is an arithmetic number, because the mean of its divisors is an integer number (669120).

Almost surely, 2^3999147 is an apocalyptic number.

3999147 is a deficient number, since it is larger than the sum of its proper divisors (1353813).

3999147 is a wasteful number, since it uses less digits than its factorization.

3999147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5193.

The product of its digits is 61236, while the sum is 42.

The square root of 3999147 is about 1999.7867386299. The cubic root of 3999147 is about 158.7288206188.

The spelling of 3999147 in words is "three million, nine hundred ninety-nine thousand, one hundred forty-seven".