1388746740 has 48 divisors (see below), whose sum is σ = 3952247040. Its totient is φ = 364260480.

The previous prime is 1388746703. The next prime is 1388746753. The reversal of 1388746740 is 476478831.

It is a self number, because there is not a number n which added to its sum of digits gives 1388746740.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 186060 + ... + 193379.

It is an arithmetic number, because the mean of its divisors is an integer number (82338480).

Almost surely, 2^1388746740 is an apocalyptic number.

1388746740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1388746740 is an abundant number, since it is smaller than the sum of its proper divisors (2563500300).

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

1388746740 is a wasteful number, since it uses less digits than its factorization.

1388746740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379512 (or 379510 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 48.

The square root of 1388746740 is about 37265.8924487258. The cubic root of 1388746740 is about 1115.6835185116.

The spelling of 1388746740 in words is "one billion, three hundred eighty-eight million, seven hundred forty-six thousand, seven hundred forty".