145731840 has 72 divisors (see below), whose sum is σ = 465443328. Its totient is φ = 38860800.

The previous prime is 145731827. The next prime is 145731851. The reversal of 145731840 is 48137541.

It is a congruent number.

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 in 7 ways as a sum of consecutive naturals, for example, 15136 + ... + 22815.

Almost surely, 2^145731840 is an apocalyptic number.

145731840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

145731840 is an abundant number, since it is smaller than the sum of its proper divisors (319711488).

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

145731840 is an equidigital number, since it uses as much as digits as its factorization.

145731840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37975 (or 37961 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 145731840 is about 12071.9443338677. The cubic root of 145731840 is about 526.2411632017.

The spelling of 145731840 in words is "one hundred forty-five million, seven hundred thirty-one thousand, eight hundred forty".