68921409 has 8 divisors (see below), whose sum is σ = 95890752. Its totient is φ = 43949840.

The previous prime is 68921407. The next prime is 68921441. The reversal of 68921409 is 90412986.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68921409 - 2¹ = 68921407 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68921407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 499362 + ... + 499499.

It is an arithmetic number, because the mean of its divisors is an integer number (11986344).

Almost surely, 2^68921409 is an apocalyptic number.

68921409 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

It is an amenable number.

68921409 is a deficient number, since it is larger than the sum of its proper divisors (26969343).

68921409 is a wasteful number, since it uses less digits than its factorization.

68921409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 998887.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 68921409 is about 8301.8918928158. The cubic root of 68921409 is about 410.0008110236. Note that the first 3 decimals are identical.

The spelling of 68921409 in words is "sixty-eight million, nine hundred twenty-one thousand, four hundred nine".