1556430040 has 64 divisors (see below), whose sum is σ = 3837404160. Its totient is φ = 563445120.

The previous prime is 1556429977. The next prime is 1556430047. The reversal of 1556430040 is 400346551.

It is a junction number, because it is equal to n+sod(n) for n = 1556429990 and 1556430008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1556430047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92089 + ... + 107671.

It is an arithmetic number, because the mean of its divisors is an integer number (59959440).

Almost surely, 2^1556430040 is an apocalyptic number.

1556430040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1556430040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1918702080).

1556430040 is an abundant number, since it is smaller than the sum of its proper divisors (2280974120).

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

1556430040 is a wasteful number, since it uses less digits than its factorization.

1556430040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15832 (or 15828 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 1556430040 is about 39451.6164434361. The cubic root of 1556430040 is about 1158.8926312807.

Adding to 1556430040 its reverse (400346551), we get a palindrome (1956776591).

The spelling of 1556430040 in words is "one billion, five hundred fifty-six million, four hundred thirty thousand, forty".