1387820798 has 16 divisors (see below), whose sum is σ = 2562131040. Its totient is φ = 549027936.

The previous prime is 1387820779. The next prime is 1387820801. The reversal of 1387820798 is 8970287831.

It is a super-2 number, since 2×1387820798² = 3852093134722713608, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3812513 + ... + 3812876.

It is an arithmetic number, because the mean of its divisors is an integer number (160133190).

Almost surely, 2^1387820798 is an apocalyptic number.

1387820798 is a deficient number, since it is larger than the sum of its proper divisors (1174310242).

1387820798 is a wasteful number, since it uses less digits than its factorization.

1387820798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7625411.

The product of its (nonzero) digits is 1354752, while the sum is 53.

The square root of 1387820798 is about 37253.4669259117. The cubic root of 1387820798 is about 1115.4355040297.

The spelling of 1387820798 in words is "one billion, three hundred eighty-seven million, eight hundred twenty thousand, seven hundred ninety-eight".