396378739 has 4 divisors (see below), whose sum is σ = 396430056. Its totient is φ = 396327424.

The previous prime is 396378733. The next prime is 396378769. The reversal of 396378739 is 937873693.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 937873693 = 17911 ⋅52363.

It is a cyclic number.

It is not a de Polignac number, because 396378739 - 2¹³ = 396370547 is a prime.

It is a super-2 number, since 2×396378739² = 314232209462460242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 396378739.

It is not an unprimeable number, because it can be changed into a prime (396378733) 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 3 ways as a sum of consecutive naturals, for example, 11449 + ... + 30394.

It is an arithmetic number, because the mean of its divisors is an integer number (99107514).

Almost surely, 2^396378739 is an apocalyptic number.

396378739 is a deficient number, since it is larger than the sum of its proper divisors (51317).

396378739 is an equidigital number, since it uses as much as digits as its factorization.

396378739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51316.

The product of its digits is 5143824, while the sum is 55.

The square root of 396378739 is about 19909.2626433025. The cubic root of 396378739 is about 734.5760826968.

The spelling of 396378739 in words is "three hundred ninety-six million, three hundred seventy-eight thousand, seven hundred thirty-nine".