1555938840 has 32 divisors (see below), whose sum is σ = 4667816880. Its totient is φ = 414916992.

The previous prime is 1555938829. The next prime is 1555938841. The reversal of 1555938840 is 488395551.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1555938840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1555938841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6482959 + ... + 6483198.

Almost surely, 2^1555938840 is an apocalyptic number.

1555938840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1555938840 is an abundant number, since it is smaller than the sum of its proper divisors (3111878040).

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

1555938840 is a wasteful number, since it uses less digits than its factorization.

1555938840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12966171 (or 12966167 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 48.

The square root of 1555938840 is about 39445.3906052406. The cubic root of 1555938840 is about 1158.7707052620.

The spelling of 1555938840 in words is "one billion, five hundred fifty-five million, nine hundred thirty-eight thousand, eight hundred forty".