1601800956 has 144 divisors (see below), whose sum is σ = 4768021440. Its totient is φ = 443888640.

The previous prime is 1601800943. The next prime is 1601800973. The reversal of 1601800956 is 6590081061.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1601800956.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2365690 + ... + 2366366.

It is an arithmetic number, because the mean of its divisors is an integer number (33111260).

Almost surely, 2^1601800956 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1601800956, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2384010720).

1601800956 is an abundant number, since it is smaller than the sum of its proper divisors (3166220484).

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

1601800956 is a wasteful number, since it uses less digits than its factorization.

1601800956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 964 (or 959 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 1601800956 is about 40022.5056187141. The cubic root of 1601800956 is about 1170.0457663448.

It can be divided in two parts, 1601800 and 956, that added together give a square (1602756 = 1266²).

The spelling of 1601800956 in words is "one billion, six hundred one million, eight hundred thousand, nine hundred fifty-six".