1398661408 has 24 divisors (see below), whose sum is σ = 2765759472. Its totient is φ = 696246336.

The previous prime is 1398661403. The next prime is 1398661409. The reversal of 1398661408 is 8041668931.

It is not an unprimeable number, because it can be changed into a prime (1398661403) 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, 89010 + ... + 103537.

It is an arithmetic number, because the mean of its divisors is an integer number (115239978).

Almost surely, 2^1398661408 is an apocalyptic number.

It is an amenable number.

1398661408 is a deficient number, since it is larger than the sum of its proper divisors (1367098064).

1398661408 is a wasteful number, since it uses less digits than its factorization.

1398661408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192784 (or 192776 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 1398661408 is about 37398.6819019066. The cubic root of 1398661408 is about 1118.3322883710.

The spelling of 1398661408 in words is "one billion, three hundred ninety-eight million, six hundred sixty-one thousand, four hundred eight".