155189797 has 16 divisors (see below), whose sum is σ = 182939904. Its totient is φ = 128880000.

The previous prime is 155189779. The next prime is 155189843. The reversal of 155189797 is 797981551.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 155189797 - 2¹⁹ = 154665509 is a prime.

Its product of digits (793800) is a multiple of the sum of its prime divisors (3780).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155189767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41547 + ... + 45127.

It is an arithmetic number, because the mean of its divisors is an integer number (11433744).

Almost surely, 2^155189797 is an apocalyptic number.

It is an amenable number.

155189797 is a deficient number, since it is larger than the sum of its proper divisors (27750107).

155189797 is a wasteful number, since it uses less digits than its factorization.

155189797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3780.

The product of its digits is 793800, while the sum is 52.

The square root of 155189797 is about 12457.5196969541. The cubic root of 155189797 is about 537.3876997765.

The spelling of 155189797 in words is "one hundred fifty-five million, one hundred eighty-nine thousand, seven hundred ninety-seven".