393838740 has 48 divisors (see below), whose sum is σ = 1225277760. Its totient is φ = 105023520.

The previous prime is 393838727. The next prime is 393838741. The reversal of 393838740 is 47838393.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393838741) 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, 364126 + ... + 365205.

It is an arithmetic number, because the mean of its divisors is an integer number (25526620).

Almost surely, 2^393838740 is an apocalyptic number.

393838740 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

393838740 is an abundant number, since it is smaller than the sum of its proper divisors (831439020).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

393838740 is a wasteful number, since it uses less digits than its factorization.

393838740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729349 (or 729341 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The square root of 393838740 is about 19845.3707448362. The cubic root of 393838740 is about 733.0036621945.

The spelling of 393838740 in words is "three hundred ninety-three million, eight hundred thirty-eight thousand, seven hundred forty".