1386139949 has 4 divisors (see below), whose sum is σ = 1386256800. Its totient is φ = 1386023100.

The previous prime is 1386139903. The next prime is 1386139957. The reversal of 1386139949 is 9499316831.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1386139949 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1386139949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1386133949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38327 + ... + 65124.

It is an arithmetic number, because the mean of its divisors is an integer number (346564200).

Almost surely, 2^1386139949 is an apocalyptic number.

It is an amenable number.

1386139949 is a deficient number, since it is larger than the sum of its proper divisors (116851).

1386139949 is a wasteful number, since it uses less digits than its factorization.

1386139949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116850.

The product of its digits is 1259712, while the sum is 53.

The square root of 1386139949 is about 37230.9004591616. The cubic root of 1386139949 is about 1114.9850049261.

The spelling of 1386139949 in words is "one billion, three hundred eighty-six million, one hundred thirty-nine thousand, nine hundred forty-nine".