145744381 has 12 divisors (see below), whose sum is σ = 150404116. Its totient is φ = 141223680.

The previous prime is 145744297. The next prime is 145744387. The reversal of 145744381 is 183447541.

145744381 = T₁₂₆ + T₁₂₇ + ... + T₉₅₆.

It can be written as a sum of positive squares in 6 ways, for example, as 115218756 + 30525625 = 10734^2 + 5525^2 .

It is not a de Polignac number, because 145744381 - 2¹⁵ = 145711613 is a prime.

It is a super-2 number, since 2×145744381² = 42482849186146322, which contains 22 as substring.

It is a Duffinian number.

Its product of digits (53760) is a multiple of the sum of its prime factors (672).

It is a self number, because there is not a number n which added to its sum of digits gives 145744381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145744387) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 465481 + ... + 465793.

Almost surely, 2^145744381 is an apocalyptic number.

It is an amenable number.

145744381 is a deficient number, since it is larger than the sum of its proper divisors (4659735).

145744381 is an equidigital number, since it uses as much as digits as its factorization.

145744381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672 (or 631 counting only the distinct ones).

The product of its digits is 53760, while the sum is 37.

The square root of 145744381 is about 12072.4637502044. The cubic root of 145744381 is about 526.2562580525.

The spelling of 145744381 in words is "one hundred forty-five million, seven hundred forty-four thousand, three hundred eighty-one".