1388402664 has 64 divisors (see below), whose sum is σ = 3794618880. Its totient is φ = 419832000.

The previous prime is 1388402641. The next prime is 1388402693. The reversal of 1388402664 is 4662048831.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 124269 + ... + 134979.

It is an arithmetic number, because the mean of its divisors is an integer number (59290920).

Almost surely, 2^1388402664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1388402664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1897309440).

1388402664 is an abundant number, since it is smaller than the sum of its proper divisors (2406216216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1388402664 is a wasteful number, since it uses less digits than its factorization.

1388402664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11222 (or 11218 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 42.

The square root of 1388402664 is about 37261.2756625427. The cubic root of 1388402664 is about 1115.5913702893.

The spelling of 1388402664 in words is "one billion, three hundred eighty-eight million, four hundred two thousand, six hundred sixty-four".