78419397 has 16 divisors (see below), whose sum is σ = 124692480. Its totient is φ = 42862512.

The previous prime is 78419377. The next prime is 78419431. The reversal of 78419397 is 79391487.

It is not a de Polignac number, because 78419397 - 2⁸ = 78419141 is a prime.

It is a super-2 number, since 2×78419397² = 12299203651687218, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78419377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80697 + ... + 81662.

It is an arithmetic number, because the mean of its divisors is an integer number (7793280).

Almost surely, 2^78419397 is an apocalyptic number.

It is an amenable number.

78419397 is a deficient number, since it is larger than the sum of its proper divisors (46273083).

78419397 is a wasteful number, since it uses less digits than its factorization.

78419397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162392.

The product of its digits is 381024, while the sum is 48.

The square root of 78419397 is about 8855.4727146550. The cubic root of 78419397 is about 428.0302861644.

The spelling of 78419397 in words is "seventy-eight million, four hundred nineteen thousand, three hundred ninety-seven".