1698637149 has 20 divisors (see below), whose sum is σ = 2768150880. Its totient is φ = 1029476520.

The previous prime is 1698637133. The next prime is 1698637159. The reversal of 1698637149 is 9417368961.

It is not a de Polignac number, because 1698637149 - 2⁴ = 1698637133 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1698637095 and 1698637104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1698637159) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 952329 + ... + 954110.

It is an arithmetic number, because the mean of its divisors is an integer number (138407544).

Almost surely, 2^1698637149 is an apocalyptic number.

It is an amenable number.

1698637149 is a deficient number, since it is larger than the sum of its proper divisors (1069513731).

1698637149 is a wasteful number, since it uses less digits than its factorization.

1698637149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1906462 (or 1906453 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 54.

The square root of 1698637149 is about 41214.5259465640. The cubic root of 1698637149 is about 1193.1641772982.

The spelling of 1698637149 in words is "one billion, six hundred ninety-eight million, six hundred thirty-seven thousand, one hundred forty-nine".