1555633340 has 12 divisors (see below), whose sum is σ = 3266830056. Its totient is φ = 622253328.

The previous prime is 1555633327. The next prime is 1555633349. The reversal of 1555633340 is 433365551.

It is a self number, because there is not a number n which added to its sum of digits gives 1555633340.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1555633349) 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, 38890814 + ... + 38890853.

It is an arithmetic number, because the mean of its divisors is an integer number (272235838).

Almost surely, 2^1555633340 is an apocalyptic number.

1555633340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1555633340 is an abundant number, since it is smaller than the sum of its proper divisors (1711196716).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1555633340 is a wasteful number, since it uses less digits than its factorization.

1555633340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77781676 (or 77781674 counting only the distinct ones).

The product of its (nonzero) digits is 81000, while the sum is 35.

The square root of 1555633340 is about 39441.5179728164. The cubic root of 1555633340 is about 1158.6948608880.

Adding to 1555633340 its reverse (433365551), we get a palindrome (1988998891).

The spelling of 1555633340 in words is "one billion, five hundred fifty-five million, six hundred thirty-three thousand, three hundred forty".