1555862406 has 80 divisors (see below), whose sum is σ = 3844271664. Its totient is φ = 418317312.

The previous prime is 1555862387. The next prime is 1555862417. The reversal of 1555862406 is 6042685551.

1555862406 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 241726 + ... + 248078.

Almost surely, 2^1555862406 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1555862406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1922135832).

1555862406 is an abundant number, since it is smaller than the sum of its proper divisors (2288409258).

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

1555862406 is an equidigital number, since it uses as much as digits as its factorization.

1555862406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6403 (or 6382 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 42.

The square root of 1555862406 is about 39444.4217348917. The cubic root of 1555862406 is about 1158.7517304522.

The spelling of 1555862406 in words is "one billion, five hundred fifty-five million, eight hundred sixty-two thousand, four hundred six".