145394437 has 2 divisors, whose sum is σ = 145394438. Its totient is φ = 145394436.

The previous prime is 145394419. The next prime is 145394507. The reversal of 145394437 is 734493541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95140516 + 50253921 = 9754^2 + 7089^2 .

It is an emirp because it is prime and its reverse (734493541) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145394437 is a prime.

It is a super-2 number, since 2×145394437² = 42279084621093938, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 145394437.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145394237) by changing a digit.

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 as a sum of consecutive naturals, namely, 72697218 + 72697219.

It is an arithmetic number, because the mean of its divisors is an integer number (72697219).

Almost surely, 2^145394437 is an apocalyptic number.

It is an amenable number.

145394437 is a deficient number, since it is larger than the sum of its proper divisors (1).

145394437 is an equidigital number, since it uses as much as digits as its factorization.

145394437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 40.

The square root of 145394437 is about 12057.9615607282. The cubic root of 145394437 is about 525.8347259377.

The spelling of 145394437 in words is "one hundred forty-five million, three hundred ninety-four thousand, four hundred thirty-seven".