788420391 has 24 divisors (see below), whose sum is σ = 1159800432. Its totient is φ = 476044800.

The previous prime is 788420387. The next prime is 788420417. The reversal of 788420391 is 193024887.

It is not a de Polignac number, because 788420391 - 2² = 788420387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (788420891) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 96631 + ... + 104471.

It is an arithmetic number, because the mean of its divisors is an integer number (48325018).

Almost surely, 2^788420391 is an apocalyptic number.

788420391 is a deficient number, since it is larger than the sum of its proper divisors (371380041).

788420391 is a wasteful number, since it uses less digits than its factorization.

788420391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8143 (or 8132 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 788420391 is about 28078.8246014679. The cubic root of 788420391 is about 923.8169989058.

The spelling of 788420391 in words is "seven hundred eighty-eight million, four hundred twenty thousand, three hundred ninety-one".