1388722464 has 72 divisors (see below), whose sum is σ = 4157047440. Its totient is φ = 438542208.

The previous prime is 1388722463. The next prime is 1388722477. The reversal of 1388722464 is 4642278831.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (72).

It is not an unprimeable number, because it can be changed into a prime (1388722463) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 121422 + ... + 132365.

It is an arithmetic number, because the mean of its divisors is an integer number (57736770).

Almost surely, 2^1388722464 is an apocalyptic number.

It is an amenable number.

1388722464 is an abundant number, since it is smaller than the sum of its proper divisors (2768324976).

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

1388722464 is a wasteful number, since it uses less digits than its factorization.

1388722464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253822 (or 253811 counting only the distinct ones).

The product of its digits is 516096, while the sum is 45.

The square root of 1388722464 is about 37265.5667339167. The cubic root of 1388722464 is about 1115.6770175685.

The spelling of 1388722464 in words is "one billion, three hundred eighty-eight million, seven hundred twenty-two thousand, four hundred sixty-four".