145771940 has 24 divisors (see below), whose sum is σ = 324128952. Its totient is φ = 54878720.

The previous prime is 145771939. The next prime is 145771961. The reversal of 145771940 is 49177541.

It can be written as a sum of positive squares in 4 ways, for example, as 66455104 + 79316836 = 8152^2 + 8906^2 .

It is a junction number, because it is equal to n+sod(n) for n = 145771894 and 145771903.

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, 214031 + ... + 214710.

It is an arithmetic number, because the mean of its divisors is an integer number (13505373).

Almost surely, 2^145771940 is an apocalyptic number.

145771940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

145771940 is an abundant number, since it is smaller than the sum of its proper divisors (178357012).

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

145771940 is a wasteful number, since it uses less digits than its factorization.

145771940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428767 (or 428765 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 38.

The square root of 145771940 is about 12073.6050954137. The cubic root of 145771940 is about 526.2894261286.

The spelling of 145771940 in words is "one hundred forty-five million, seven hundred seventy-one thousand, nine hundred forty".