120155999 has 8 divisors (see below), whose sum is σ = 121540608. Its totient is φ = 118779640.

The previous prime is 120155957. The next prime is 120156011. The reversal of 120155999 is 999551021.

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 120155999 - 2¹⁶ = 120090463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120155599) 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, 30014 + ... + 33780.

It is an arithmetic number, because the mean of its divisors is an integer number (15192576).

Almost surely, 2^120155999 is an apocalyptic number.

120155999 is a deficient number, since it is larger than the sum of its proper divisors (1384609).

120155999 is a wasteful number, since it uses less digits than its factorization.

120155999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4125.

The product of its (nonzero) digits is 36450, while the sum is 41.

The square root of 120155999 is about 10961.5691851121. The cubic root of 120155999 is about 493.4560593238.

The spelling of 120155999 in words is "one hundred twenty million, one hundred fifty-five thousand, nine hundred ninety-nine".