1386520247 has 32 divisors (see below), whose sum is σ = 1752468480. Its totient is φ = 1070657280.

The previous prime is 1386520241. The next prime is 1386520249. The reversal of 1386520247 is 7420256831.

It is a happy number.

It is not a de Polignac number, because 1386520247 - 2⁸ = 1386519991 is a prime.

It is a super-3 number, since 3×1386520247³ (a number of 28 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1386520247.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1386520241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 187808 + ... + 195050.

It is an arithmetic number, because the mean of its divisors is an integer number (54764640).

Almost surely, 2^1386520247 is an apocalyptic number.

1386520247 is a deficient number, since it is larger than the sum of its proper divisors (365948233).

1386520247 is a wasteful number, since it uses less digits than its factorization.

1386520247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7343.

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 1386520247 is about 37236.0073987532. The cubic root of 1386520247 is about 1115.0869637977.

The spelling of 1386520247 in words is "one billion, three hundred eighty-six million, five hundred twenty thousand, two hundred forty-seven".