145121340 has 144 divisors (see below), whose sum is σ = 509175072. Its totient is φ = 30610944.

The previous prime is 145121309. The next prime is 145121351. The reversal of 145121340 is 43121541.

It is a Harshad number since it is a multiple of its sum of digits (21).

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 47 ways as a sum of consecutive naturals, for example, 36322 + ... + 40118.

It is an arithmetic number, because the mean of its divisors is an integer number (3535938).

Almost surely, 2^145121340 is an apocalyptic number.

145121340 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 145121340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (254587536).

145121340 is an abundant number, since it is smaller than the sum of its proper divisors (364053732).

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

145121340 is a wasteful number, since it uses less digits than its factorization.

145121340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3836 (or 3827 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 145121340 is about 12046.6318944342. The cubic root of 145121340 is about 525.5052912993.

Adding to 145121340 its reverse (43121541), we get a palindrome (188242881).

It can be divided in two parts, 1451 and 21340, that added together give a triangular number (22791 = T₂₁₃).

The spelling of 145121340 in words is "one hundred forty-five million, one hundred twenty-one thousand, three hundred forty".