145405440 has 120 divisors (see below), whose sum is σ = 503659728. Its totient is φ = 38768640.

The previous prime is 145405367. The next prime is 145405457. The reversal of 145405440 is 44504541.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×145405440² = 42285483963187200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19885 + ... + 26195.

Almost surely, 2^145405440 is an apocalyptic number.

145405440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 145405440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (251829864).

145405440 is an abundant number, since it is smaller than the sum of its proper divisors (358254288).

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

145405440 is an equidigital number, since it uses as much as digits as its factorization.

145405440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6340 (or 6321 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 27.

The square root of 145405440 is about 12058.4178066610. The cubic root of 145405440 is about 525.8479901168.

Adding to 145405440 its reverse (44504541), we get a palindrome (189909981).

The spelling of 145405440 in words is "one hundred forty-five million, four hundred five thousand, four hundred forty".