1398497764 has 6 divisors (see below), whose sum is σ = 2447371094. Its totient is φ = 699248880.

The previous prime is 1398497747. The next prime is 1398497797. The reversal of 1398497764 is 4677948931.

It can be written as a sum of positive squares in only one way, i.e., 1384435264 + 14062500 = 37208^2 + 3750^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1398497699 and 1398497708.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 174812217 + ... + 174812224.

Almost surely, 2^1398497764 is an apocalyptic number.

It is an amenable number.

1398497764 is a deficient number, since it is larger than the sum of its proper divisors (1048873330).

1398497764 is a wasteful number, since it uses less digits than its factorization.

1398497764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349624445 (or 349624443 counting only the distinct ones).

The product of its digits is 9144576, while the sum is 58.

The square root of 1398497764 is about 37396.4940067916. The cubic root of 1398497764 is about 1118.2886715467.

The spelling of 1398497764 in words is "one billion, three hundred ninety-eight million, four hundred ninety-seven thousand, seven hundred sixty-four".