1385557811 has 12 divisors (see below), whose sum is σ = 1523870376. Its totient is φ = 1258852320.

The previous prime is 1385557801. The next prime is 1385557837. The reversal of 1385557811 is 1187555831.

It is not a de Polignac number, because 1385557811 - 2²⁶ = 1318448947 is a prime.

It is a super-2 number, since 2×1385557811² = 3839540895246223442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1385557801) 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, 383831 + ... + 387423.

It is an arithmetic number, because the mean of its divisors is an integer number (126989198).

Almost surely, 2^1385557811 is an apocalyptic number.

1385557811 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1385557811 is a deficient number, since it is larger than the sum of its proper divisors (138312565).

1385557811 is a wasteful number, since it uses less digits than its factorization.

1385557811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6802 (or 6791 counting only the distinct ones).

The product of its digits is 168000, while the sum is 44.

The square root of 1385557811 is about 37223.0816967107. The cubic root of 1385557811 is about 1114.8288961035.

The spelling of 1385557811 in words is "one billion, three hundred eighty-five million, five hundred fifty-seven thousand, eight hundred eleven".