1399471749 has 24 divisors (see below), whose sum is σ = 2257589152. Its totient is φ = 861211440.

The previous prime is 1399471741. The next prime is 1399471769. The reversal of 1399471749 is 9471749931.

1399471749 is a `hidden beast` number, since 13 + 99 + 471 + 74 + 9 = 666.

It is not a de Polignac number, because 1399471749 - 2³ = 1399471741 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1399471695 and 1399471704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1399471741) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 218347 + ... + 224664.

Almost surely, 2^1399471749 is an apocalyptic number.

It is an amenable number.

1399471749 is a deficient number, since it is larger than the sum of its proper divisors (858117403).

1399471749 is an equidigital number, since it uses as much as digits as its factorization.

1399471749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443039 (or 443027 counting only the distinct ones).

The product of its digits is 1714608, while the sum is 54.

The square root of 1399471749 is about 37409.5141508146. The cubic root of 1399471749 is about 1118.5482223447.

The spelling of 1399471749 in words is "one billion, three hundred ninety-nine million, four hundred seventy-one thousand, seven hundred forty-nine".