78397969 has 8 divisors (see below), whose sum is σ = 84514752. Its totient is φ = 72293520.

The previous prime is 78397967. The next prime is 78397981. The reversal of 78397969 is 96979387.

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

It is not a de Polignac number, because 78397969 - 2¹ = 78397967 is a prime.

It is a super-2 number, since 2×78397969² = 12292483086649922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78397967) 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, 13434 + ... + 18364.

It is an arithmetic number, because the mean of its divisors is an integer number (10564344).

Almost surely, 2^78397969 is an apocalyptic number.

It is an amenable number.

78397969 is a deficient number, since it is larger than the sum of its proper divisors (6116783).

78397969 is a wasteful number, since it uses less digits than its factorization.

78397969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6167.

The product of its digits is 5143824, while the sum is 58.

The square root of 78397969 is about 8854.2627586943. The cubic root of 78397969 is about 427.9912963700.

The spelling of 78397969 in words is "seventy-eight million, three hundred ninety-seven thousand, nine hundred sixty-nine".