1897383139 has 2 divisors, whose sum is σ = 1897383140. Its totient is φ = 1897383138.

The previous prime is 1897383133. The next prime is 1897383157. The reversal of 1897383139 is 9313837981.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1897383139 - 2⁷ = 1897383011 is a prime.

It is a super-2 number, since 2×1897383139² = 7200125552322986642, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1897383133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 948691569 + 948691570.

It is an arithmetic number, because the mean of its divisors is an integer number (948691570).

Almost surely, 2^1897383139 is an apocalyptic number.

1897383139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1897383139 is an equidigital number, since it uses as much as digits as its factorization.

1897383139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 979776, while the sum is 52.

The square root of 1897383139 is about 43558.9616382209. The cubic root of 1897383139 is about 1237.9934463669.

The spelling of 1897383139 in words is "one billion, eight hundred ninety-seven million, three hundred eighty-three thousand, one hundred thirty-nine".