1396779247 has 8 divisors (see below), whose sum is σ = 1408442112. Its totient is φ = 1385131800.

The previous prime is 1396779239. The next prime is 1396779271. The reversal of 1396779247 is 7429776931.

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

It is a cyclic number.

It is not a de Polignac number, because 1396779247 - 2³ = 1396779239 is a prime.

It is a super-3 number, since 3×1396779247³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1396779047) 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, 241722 + ... + 247432.

It is an arithmetic number, because the mean of its divisors is an integer number (176055264).

Almost surely, 2^1396779247 is an apocalyptic number.

1396779247 is a deficient number, since it is larger than the sum of its proper divisors (11662865).

1396779247 is a wasteful number, since it uses less digits than its factorization.

1396779247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7709.

The product of its digits is 4000752, while the sum is 55.

The square root of 1396779247 is about 37373.5099636093. The cubic root of 1396779247 is about 1117.8304213040.

The spelling of 1396779247 in words is "one billion, three hundred ninety-six million, seven hundred seventy-nine thousand, two hundred forty-seven".