1699724421 has 12 divisors (see below), whose sum is σ = 2486236480. Its totient is φ = 1118805480.

The previous prime is 1699724359. The next prime is 1699724431. The reversal of 1699724421 is 1244279961.

It is not a de Polignac number, because 1699724421 - 2⁷ = 1699724293 is a prime.

It is a super-3 number, since 3×1699724421³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1699724431) 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 11 ways as a sum of consecutive naturals, for example, 1194595 + ... + 1196016.

Almost surely, 2^1699724421 is an apocalyptic number.

It is an amenable number.

1699724421 is a deficient number, since it is larger than the sum of its proper divisors (786512059).

1699724421 is a wasteful number, since it uses less digits than its factorization.

1699724421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2390696 (or 2390693 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 1699724421 is about 41227.7142344807. The cubic root of 1699724421 is about 1193.4186984610.

The spelling of 1699724421 in words is "one billion, six hundred ninety-nine million, seven hundred twenty-four thousand, four hundred twenty-one".