1397784028 has 12 divisors (see below), whose sum is σ = 2448904752. Its totient is φ = 698096960.

The previous prime is 1397784007. The next prime is 1397784097. The reversal of 1397784028 is 8204877931.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 194800 + ... + 201847.

It is an arithmetic number, because the mean of its divisors is an integer number (204075396).

Almost surely, 2^1397784028 is an apocalyptic number.

It is an amenable number.

1397784028 is a deficient number, since it is larger than the sum of its proper divisors (1051120724).

1397784028 is a wasteful number, since it uses less digits than its factorization.

1397784028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397532 (or 397530 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 49.

The square root of 1397784028 is about 37386.9499692072. The cubic root of 1397784028 is about 1118.0983962561.

The spelling of 1397784028 in words is "one billion, three hundred ninety-seven million, seven hundred eighty-four thousand, twenty-eight".