1688227401 has 16 divisors (see below), whose sum is σ = 2573133824. Its totient is φ = 964477584.

The previous prime is 1688227397. The next prime is 1688227403. The reversal of 1688227401 is 1047228861.

It is a happy number.

It is not a de Polignac number, because 1688227401 - 2² = 1688227397 is a prime.

It is a super-2 number, since 2×1688227401² = 5700223514974429602, 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 1688227401.

It is not an unprimeable number, because it can be changed into a prime (1688227403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136080 + ... + 147966.

It is an arithmetic number, because the mean of its divisors is an integer number (160820864).

Almost surely, 2^1688227401 is an apocalyptic number.

It is an amenable number.

1688227401 is a deficient number, since it is larger than the sum of its proper divisors (884906423).

1688227401 is a wasteful number, since it uses less digits than its factorization.

1688227401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18660.

The product of its (nonzero) digits is 43008, while the sum is 39.

The square root of 1688227401 is about 41088.0445020203. The cubic root of 1688227401 is about 1190.7218276789.

The spelling of 1688227401 in words is "one billion, six hundred eighty-eight million, two hundred twenty-seven thousand, four hundred one".