1699221852 has 36 divisors (see below), whose sum is σ = 4302250680. Its totient is φ = 565484832.

The previous prime is 1699221809. The next prime is 1699221857. The reversal of 1699221852 is 2581229961.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 1699221798 and 1699221807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1699221857) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15843 + ... + 60410.

Almost surely, 2^1699221852 is an apocalyptic number.

1699221852 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1699221852 is an abundant number, since it is smaller than the sum of its proper divisors (2603028828).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1699221852 is a wasteful number, since it uses less digits than its factorization.

1699221852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76882 (or 76877 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 1699221852 is about 41221.6187455078. The cubic root of 1699221852 is about 1193.3010648107.

The spelling of 1699221852 in words is "one billion, six hundred ninety-nine million, two hundred twenty-one thousand, eight hundred fifty-two".