1386285731 has 4 divisors (see below), whose sum is σ = 1386417864. Its totient is φ = 1386153600.

The previous prime is 1386285707. The next prime is 1386285749. The reversal of 1386285731 is 1375826831.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1386285731 - 2²⁶ = 1319176867 is a prime.

It is a super-2 number, since 2×1386285731² = 3843576255948408722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1386285751) 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, 48830 + ... + 71811.

It is an arithmetic number, because the mean of its divisors is an integer number (346604466).

Almost surely, 2^1386285731 is an apocalyptic number.

1386285731 is a deficient number, since it is larger than the sum of its proper divisors (132133).

1386285731 is a wasteful number, since it uses less digits than its factorization.

1386285731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132132.

The product of its digits is 241920, while the sum is 44.

The square root of 1386285731 is about 37232.8582169030. The cubic root of 1386285731 is about 1115.0240916591.

The spelling of 1386285731 in words is "one billion, three hundred eighty-six million, two hundred eighty-five thousand, seven hundred thirty-one".