1897896549 has 4 divisors (see below), whose sum is σ = 2530528736. Its totient is φ = 1265264364.

The previous prime is 1897896499. The next prime is 1897896563. The reversal of 1897896549 is 9456987981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1897896549 - 2⁷ = 1897896421 is a prime.

It is a super-2 number, since 2×1897896549² = 7204022621412218802, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1897896549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1897891549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 316316089 + ... + 316316094.

It is an arithmetic number, because the mean of its divisors is an integer number (632632184).

Almost surely, 2^1897896549 is an apocalyptic number.

It is an amenable number.

1897896549 is a deficient number, since it is larger than the sum of its proper divisors (632632187).

1897896549 is an equidigital number, since it uses as much as digits as its factorization.

1897896549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 632632186.

The product of its digits is 39191040, while the sum is 66.

The square root of 1897896549 is about 43564.8545159972. The cubic root of 1897896549 is about 1238.1050985476.

The spelling of 1897896549 in words is "one billion, eight hundred ninety-seven million, eight hundred ninety-six thousand, five hundred forty-nine".