1399320549 has 16 divisors (see below), whose sum is σ = 2261528640. Its totient is φ = 848072880.

The previous prime is 1399320547. The next prime is 1399320581. The reversal of 1399320549 is 9450239931.

1399320549 is a `hidden beast` number, since 13 + 9 + 93 + 2 + 0 + 549 = 666.

It is not a de Polignac number, because 1399320549 - 2¹ = 1399320547 is a prime.

It is a super-2 number, since 2×1399320549² = 3916195997707322802, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1399320547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2355462 + ... + 2356055.

It is an arithmetic number, because the mean of its divisors is an integer number (141345540).

Almost surely, 2^1399320549 is an apocalyptic number.

It is an amenable number.

1399320549 is a deficient number, since it is larger than the sum of its proper divisors (862208091).

1399320549 is a wasteful number, since it uses less digits than its factorization.

1399320549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4711537 (or 4711531 counting only the distinct ones).

The product of its (nonzero) digits is 262440, while the sum is 45.

The square root of 1399320549 is about 37407.4932199419. The cubic root of 1399320549 is about 1118.5079379583.

The spelling of 1399320549 in words is "one billion, three hundred ninety-nine million, three hundred twenty thousand, five hundred forty-nine".