1388577073 has 4 divisors (see below), whose sum is σ = 1495390708. Its totient is φ = 1281763440.

The previous prime is 1388577059. The next prime is 1388577089. The reversal of 1388577073 is 3707758831.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 388562944 + 1000014129 = 19712^2 + 31623^2 .

It is a cyclic number.

It is not a de Polignac number, because 1388577073 - 2¹⁷ = 1388446001 is a prime.

It is a super-2 number, since 2×1388577073² = 3856292575322494658, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1388577013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53406798 + ... + 53406823.

It is an arithmetic number, because the mean of its divisors is an integer number (373847677).

Almost surely, 2^1388577073 is an apocalyptic number.

1388577073 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1388577073 is a deficient number, since it is larger than the sum of its proper divisors (106813635).

1388577073 is a wasteful number, since it uses less digits than its factorization.

1388577073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106813634.

The product of its (nonzero) digits is 987840, while the sum is 49.

The square root of 1388577073 is about 37263.6159410221. The cubic root of 1388577073 is about 1115.6380812889.

The spelling of 1388577073 in words is "one billion, three hundred eighty-eight million, five hundred seventy-seven thousand, seventy-three".