4155999 has 4 divisors (see below), whose sum is σ = 5541336. Its totient is φ = 2770664.

The previous prime is 4155997. The next prime is 4156001. The reversal of 4155999 is 9995514.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (4155997) and next prime (4156001).

It is a cyclic number.

It is not a de Polignac number, because 4155999 - 2¹ = 4155997 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 4155999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4155997) 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, 692664 + ... + 692669.

It is an arithmetic number, because the mean of its divisors is an integer number (1385334).

Almost surely, 2^4155999 is an apocalyptic number.

4155999 is a deficient number, since it is larger than the sum of its proper divisors (1385337).

4155999 is a wasteful number, since it uses less digits than its factorization.

4155999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1385336.

The product of its digits is 72900, while the sum is 42.

The square root of 4155999 is about 2038.6267436684. The cubic root of 4155999 is about 160.7774531517. Note that the first 3 decimals are identical.

The spelling of 4155999 in words is "four million, one hundred fifty-five thousand, nine hundred ninety-nine".