155389898 has 4 divisors (see below), whose sum is σ = 233084850. Its totient is φ = 77694948.

The previous prime is 155389891. The next prime is 155389901. The reversal of 155389898 is 898983551.

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

It can be written as a sum of positive squares in only one way, i.e., 114340249 + 41049649 = 10693^2 + 6407^2 .

It is not an unprimeable number, because it can be changed into a prime (155389891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38847473 + ... + 38847476.

Almost surely, 2^155389898 is an apocalyptic number.

155389898 is a deficient number, since it is larger than the sum of its proper divisors (77694952).

155389898 is an equidigital number, since it uses as much as digits as its factorization.

155389898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77694951.

The product of its digits is 3110400, while the sum is 56.

The square root of 155389898 is about 12465.5484436105. The cubic root of 155389898 is about 537.6185689750.

The spelling of 155389898 in words is "one hundred fifty-five million, three hundred eighty-nine thousand, eight hundred ninety-eight".