145887397 has 2 divisors, whose sum is σ = 145887398. Its totient is φ = 145887396.

The previous prime is 145887283. The next prime is 145887403. The reversal of 145887397 is 793788541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 132572196 + 13315201 = 11514^2 + 3649^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145887397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145887097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72943698 + 72943699.

It is an arithmetic number, because the mean of its divisors is an integer number (72943699).

Almost surely, 2^145887397 is an apocalyptic number.

It is an amenable number.

145887397 is a deficient number, since it is larger than the sum of its proper divisors (1).

145887397 is an equidigital number, since it uses as much as digits as its factorization.

145887397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1693440, while the sum is 52.

The square root of 145887397 is about 12078.3855295317. The cubic root of 145887397 is about 526.4283366370.

The spelling of 145887397 in words is "one hundred forty-five million, eight hundred eighty-seven thousand, three hundred ninety-seven".