1386722481 has 4 divisors (see below), whose sum is σ = 1848963312. Its totient is φ = 924481652.

The previous prime is 1386722479. The next prime is 1386722507. The reversal of 1386722481 is 1842276831.

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 not a de Polignac number, because 1386722481 - 2¹ = 1386722479 is a prime.

It is a super-2 number, since 2×1386722481² = 3845998478621590722, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1386722401) 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, 231120411 + ... + 231120416.

It is an arithmetic number, because the mean of its divisors is an integer number (462240828).

Almost surely, 2^1386722481 is an apocalyptic number.

It is an amenable number.

1386722481 is a deficient number, since it is larger than the sum of its proper divisors (462240831).

1386722481 is an equidigital number, since it uses as much as digits as its factorization.

1386722481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462240830.

The product of its digits is 129024, while the sum is 42.

The square root of 1386722481 is about 37238.7228701522. The cubic root of 1386722481 is about 1115.1411756599.

The spelling of 1386722481 in words is "one billion, three hundred eighty-six million, seven hundred twenty-two thousand, four hundred eighty-one".