1385490881 has 4 divisors (see below), whose sum is σ = 1385571264. Its totient is φ = 1385410500.

The previous prime is 1385490851. The next prime is 1385490893. The reversal of 1385490881 is 1880945831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1385490881 - 2¹⁸ = 1385228737 is a prime.

It is a super-2 number, since 2×1385490881² = 3839169962668312322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1385490851) 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, 2645 + ... + 52706.

It is an arithmetic number, because the mean of its divisors is an integer number (346392816).

Almost surely, 2^1385490881 is an apocalyptic number.

It is an amenable number.

1385490881 is a deficient number, since it is larger than the sum of its proper divisors (80383).

1385490881 is an equidigital number, since it uses as much as digits as its factorization.

1385490881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80382.

The product of its (nonzero) digits is 276480, while the sum is 47.

The square root of 1385490881 is about 37222.1826469110. The cubic root of 1385490881 is about 1114.8109450423.

The spelling of 1385490881 in words is "one billion, three hundred eighty-five million, four hundred ninety thousand, eight hundred eighty-one".