145219890 has 16 divisors (see below), whose sum is σ = 348527808. Its totient is φ = 38725296.

The previous prime is 145219889. The next prime is 145219891. The reversal of 145219890 is 98912541.

It is an interprime number because it is at equal distance from previous prime (145219889) and next prime (145219891).

It is a super-2 number, since 2×145219890² = 42177632903224200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (145219891) 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 7 ways as a sum of consecutive naturals, for example, 2420302 + ... + 2420361.

It is an arithmetic number, because the mean of its divisors is an integer number (21782988).

Almost surely, 2^145219890 is an apocalyptic number.

145219890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

145219890 is an abundant number, since it is smaller than the sum of its proper divisors (203307918).

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

145219890 is a wasteful number, since it uses less digits than its factorization.

145219890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4840673.

The product of its (nonzero) digits is 25920, while the sum is 39.

The square root of 145219890 is about 12050.7215551601. The cubic root of 145219890 is about 525.6242189679.

The spelling of 145219890 in words is "one hundred forty-five million, two hundred nineteen thousand, eight hundred ninety".