68421397 has 8 divisors (see below), whose sum is σ = 74888352. Its totient is φ = 61995600.

The previous prime is 68421373. The next prime is 68421401. The reversal of 68421397 is 79312486.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68421397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68421317) 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, 6754 + ... + 13507.

It is an arithmetic number, because the mean of its divisors is an integer number (9361044).

Almost surely, 2^68421397 is an apocalyptic number.

68421397 is the 6754-th pentagonal number.

It is an amenable number.

68421397 is a deficient number, since it is larger than the sum of its proper divisors (6466955).

68421397 is a wasteful number, since it uses less digits than its factorization.

68421397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20579.

The product of its digits is 72576, while the sum is 40.

The square root of 68421397 is about 8271.7227347149. The cubic root of 68421397 is about 409.0069104110.

The spelling of 68421397 in words is "sixty-eight million, four hundred twenty-one thousand, three hundred ninety-seven".