19145389 has 2 divisors, whose sum is σ = 19145390. Its totient is φ = 19145388.

The previous prime is 19145359. The next prime is 19145393. The reversal of 19145389 is 98354191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15342889 + 3802500 = 3917^2 + 1950^2 .

It is a cyclic number.

It is not a de Polignac number, because 19145389 - 2⁷ = 19145261 is a prime.

It is a super-2 number, since 2×19145389² = 733091839922642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19145359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9572694 + 9572695.

It is an arithmetic number, because the mean of its divisors is an integer number (9572695).

Almost surely, 2^19145389 is an apocalyptic number.

It is an amenable number.

19145389 is a deficient number, since it is larger than the sum of its proper divisors (1).

19145389 is an equidigital number, since it uses as much as digits as its factorization.

19145389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 40.

The square root of 19145389 is about 4375.5444232689. The cubic root of 19145389 is about 267.5190611508.

The spelling of 19145389 in words is "nineteen million, one hundred forty-five thousand, three hundred eighty-nine".