1698873649 has 4 divisors (see below), whose sum is σ = 1853316720. Its totient is φ = 1544430580.

The previous prime is 1698873647. The next prime is 1698873653. The reversal of 1698873649 is 9463788961.

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 1698873649 - 2¹ = 1698873647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1698873643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77221519 + ... + 77221540.

It is an arithmetic number, because the mean of its divisors is an integer number (463329180).

Almost surely, 2^1698873649 is an apocalyptic number.

It is an amenable number.

1698873649 is a deficient number, since it is larger than the sum of its proper divisors (154443071).

1698873649 is a wasteful number, since it uses less digits than its factorization.

1698873649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154443070.

The product of its digits is 15676416, while the sum is 61.

The square root of 1698873649 is about 41217.3949807602. The cubic root of 1698873649 is about 1193.2195491852.

The spelling of 1698873649 in words is "one billion, six hundred ninety-eight million, eight hundred seventy-three thousand, six hundred forty-nine".