155949799 has 4 divisors (see below), whose sum is σ = 157071880. Its totient is φ = 154827720.

The previous prime is 155949793. The next prime is 155949811. The reversal of 155949799 is 997949551.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 155949799 - 2⁷ = 155949671 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 (155949793) 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, 560832 + ... + 561109.

It is an arithmetic number, because the mean of its divisors is an integer number (39267970).

Almost surely, 2^155949799 is an apocalyptic number.

155949799 is a deficient number, since it is larger than the sum of its proper divisors (1122081).

155949799 is a wasteful number, since it uses less digits than its factorization.

155949799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122080.

The product of its digits is 4592700, while the sum is 58.

The square root of 155949799 is about 12487.9861867316. The cubic root of 155949799 is about 538.2635108562.

The spelling of 155949799 in words is "one hundred fifty-five million, nine hundred forty-nine thousand, seven hundred ninety-nine".