1388340642 has 32 divisors (see below), whose sum is σ = 3086737920. Its totient is φ = 413400960.

The previous prime is 1388340641. The next prime is 1388340643. The reversal of 1388340642 is 2460438831.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1388340641) and next prime (1388340643).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 1388340642.

It is not an unprimeable number, because it can be changed into a prime (1388340641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 284667 + ... + 289502.

It is an arithmetic number, because the mean of its divisors is an integer number (96460560).

Almost surely, 2^1388340642 is an apocalyptic number.

1388340642 is an abundant number, since it is smaller than the sum of its proper divisors (1698397278).

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

1388340642 is a wasteful number, since it uses less digits than its factorization.

1388340642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574218.

The product of its (nonzero) digits is 110592, while the sum is 39.

The square root of 1388340642 is about 37260.4433951074. The cubic root of 1388340642 is about 1115.5747583366.

The spelling of 1388340642 in words is "one billion, three hundred eighty-eight million, three hundred forty thousand, six hundred forty-two".