155457898 has 4 divisors (see below), whose sum is σ = 233186850. Its totient is φ = 77728948.

The previous prime is 155457881. The next prime is 155457917. The reversal of 155457898 is 898754551.

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., 155077209 + 380689 = 12453^2 + 617^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38864473 + ... + 38864476.

Almost surely, 2^155457898 is an apocalyptic number.

155457898 is a deficient number, since it is larger than the sum of its proper divisors (77728952).

155457898 is an equidigital number, since it uses as much as digits as its factorization.

155457898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77728951.

The product of its digits is 2016000, while the sum is 52.

The square root of 155457898 is about 12468.2756626568. The cubic root of 155457898 is about 537.6969797592.

The spelling of 155457898 in words is "one hundred fifty-five million, four hundred fifty-seven thousand, eight hundred ninety-eight".