1388820044 has 6 divisors (see below), whose sum is σ = 2430435084. Its totient is φ = 694410020.

The previous prime is 1388820031. The next prime is 1388820053. The reversal of 1388820044 is 4400288831.

It is a super-2 number, since 2×1388820044² = 3857642229232323872, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 173602502 + ... + 173602509.

It is an arithmetic number, because the mean of its divisors is an integer number (405072514).

Almost surely, 2^1388820044 is an apocalyptic number.

It is an amenable number.

1388820044 is a deficient number, since it is larger than the sum of its proper divisors (1041615040).

1388820044 is a wasteful number, since it uses less digits than its factorization.

1388820044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347205015 (or 347205013 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 38.

The square root of 1388820044 is about 37266.8759624415. The cubic root of 1388820044 is about 1115.7031483509.

The spelling of 1388820044 in words is "one billion, three hundred eighty-eight million, eight hundred twenty thousand, forty-four".