1388537091 has 12 divisors (see below), whose sum is σ = 2008324032. Its totient is φ = 924464016.

The previous prime is 1388537077. The next prime is 1388537099. The reversal of 1388537091 is 1907358831.

It is not a de Polignac number, because 1388537091 - 2¹³ = 1388528899 is a prime.

It is a super-3 number, since 3×1388537091³ (a number of 28 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1388537099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 95091 + ... + 108716.

It is an arithmetic number, because the mean of its divisors is an integer number (167360336).

Almost surely, 2^1388537091 is an apocalyptic number.

1388537091 is a deficient number, since it is larger than the sum of its proper divisors (619786941).

1388537091 is a wasteful number, since it uses less digits than its factorization.

1388537091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204570 (or 204567 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The square root of 1388537091 is about 37263.0794621164. The cubic root of 1388537091 is about 1115.6273734761.

The spelling of 1388537091 in words is "one billion, three hundred eighty-eight million, five hundred thirty-seven thousand, ninety-one".