1388381974 has 24 divisors (see below), whose sum is σ = 2474137440. Its totient is φ = 582358896.

The previous prime is 1388381971. The next prime is 1388381987. The reversal of 1388381974 is 4791838831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388381971) 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, 146109 + ... + 155320.

It is an arithmetic number, because the mean of its divisors is an integer number (103089060).

Almost surely, 2^1388381974 is an apocalyptic number.

1388381974 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1388381974 is a deficient number, since it is larger than the sum of its proper divisors (1085755466).

1388381974 is a wasteful number, since it uses less digits than its factorization.

1388381974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301492 (or 301485 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 52.

The square root of 1388381974 is about 37260.9980274281. The cubic root of 1388381974 is about 1115.5858287413.

The spelling of 1388381974 in words is "one billion, three hundred eighty-eight million, three hundred eighty-one thousand, nine hundred seventy-four".