1398643946 has 12 divisors (see below), whose sum is σ = 2440491138. Its totient is φ = 599418792.

The previous prime is 1398643927. The next prime is 1398643949. The reversal of 1398643946 is 6493468931.

It can be written as a sum of positive squares in only one way, i.e., 1145484025 + 253159921 = 33845^2 + 15911^2 .

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1398643949) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7135841 + ... + 7136036.

Almost surely, 2^1398643946 is an apocalyptic number.

1398643946 is a deficient number, since it is larger than the sum of its proper divisors (1041847192).

1398643946 is a wasteful number, since it uses less digits than its factorization.

1398643946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14271893 (or 14271886 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 53.

The square root of 1398643946 is about 37398.4484437523. The cubic root of 1398643946 is about 1118.3276343021.

The spelling of 1398643946 in words is "one billion, three hundred ninety-eight million, six hundred forty-three thousand, nine hundred forty-six".