1601778 has 16 divisors (see below), whose sum is σ = 3219840. Its totient is φ = 531216.

The previous prime is 1601777. The next prime is 1601779. The reversal of 1601778 is 8771061.

It is an interprime number because it is at equal distance from previous prime (1601777) and next prime (1601779).

It is a super-2 number, since 2×1601778² = 5131385522568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1601773) 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, 876 + ... + 1992.

It is an arithmetic number, because the mean of its divisors is an integer number (201240).

2^1601778 is an apocalyptic number.

1601778 is an abundant number, since it is smaller than the sum of its proper divisors (1618062).

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

1601778 is a wasteful number, since it uses less digits than its factorization.

1601778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1361.

The product of its (nonzero) digits is 2352, while the sum is 30.

The square root of 1601778 is about 1265.6136851346. The cubic root of 1601778 is about 117.0040176866.

The spelling of 1601778 in words is "one million, six hundred one thousand, seven hundred seventy-eight".