145721898 has 24 divisors (see below), whose sum is σ = 360835488. Its totient is φ = 41634792.

The previous prime is 145721893. The next prime is 145721903. The reversal of 145721898 is 898127541.

It is an interprime number because it is at equal distance from previous prime (145721893) and next prime (145721903).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (145721893) 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 in 11 ways as a sum of consecutive naturals, for example, 578136 + ... + 578387.

It is an arithmetic number, because the mean of its divisors is an integer number (15034812).

Almost surely, 2^145721898 is an apocalyptic number.

145721898 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

145721898 is an abundant number, since it is smaller than the sum of its proper divisors (215113590).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

145721898 is a wasteful number, since it uses less digits than its factorization.

145721898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1156538 (or 1156535 counting only the distinct ones).

The product of its digits is 161280, while the sum is 45.

The square root of 145721898 is about 12071.5325456215. The cubic root of 145721898 is about 526.2291959962.

The spelling of 145721898 in words is "one hundred forty-five million, seven hundred twenty-one thousand, eight hundred ninety-eight".