145421616 has 40 divisors (see below), whose sum is σ = 378212400. Its totient is φ = 48146176.

The previous prime is 145421603. The next prime is 145421623. The reversal of 145421616 is 616124541.

It is a super-2 number, since 2×145421616² = 42294892800102912, which contains 22 as substring.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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, 3015 + ... + 17318.

It is an arithmetic number, because the mean of its divisors is an integer number (9455310).

Almost surely, 2^145421616 is an apocalyptic number.

145421616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

145421616 is an abundant number, since it is smaller than the sum of its proper divisors (232790784).

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

145421616 is a wasteful number, since it uses less digits than its factorization.

145421616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20493 (or 20487 counting only the distinct ones).

The product of its digits is 5760, while the sum is 30.

The square root of 145421616 is about 12059.0885227699. The cubic root of 145421616 is about 525.8674891618.

The spelling of 145421616 in words is "one hundred forty-five million, four hundred twenty-one thousand, six hundred sixteen".