145840554 has 32 divisors (see below), whose sum is σ = 334548480. Its totient is φ = 47044800.

The previous prime is 145840553. The next prime is 145840559. The reversal of 145840554 is 455048541.

It is a happy number.

145840554 is a `hidden beast` number, since 14 + 58 + 40 + 554 = 666.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (145840553) 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 15 ways as a sum of consecutive naturals, for example, 41887 + ... + 45234.

It is an arithmetic number, because the mean of its divisors is an integer number (10454640).

Almost surely, 2^145840554 is an apocalyptic number.

145840554 is an abundant number, since it is smaller than the sum of its proper divisors (188707926).

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

145840554 is a wasteful number, since it uses less digits than its factorization.

145840554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87163 (or 87157 counting only the distinct ones).

The product of its (nonzero) digits is 64000, while the sum is 36.

The square root of 145840554 is about 12076.4462487936. The cubic root of 145840554 is about 526.3719869617.

The spelling of 145840554 in words is "one hundred forty-five million, eight hundred forty thousand, five hundred fifty-four".