1961216 has 36 divisors (see below), whose sum is σ = 4022592. Its totient is φ = 953856.

The previous prime is 1961213. The next prime is 1961221. The reversal of 1961216 is 6121691.

It is a plaindrome in base 7.

It is a zygodrome in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1961213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11951 + ... + 12113.

2^1961216 is an apocalyptic number.

1961216 is a gapful number since it is divisible by the number (16) 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 1961216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2011296).

1961216 is an abundant number, since it is smaller than the sum of its proper divisors (2061376).

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

1961216 is an equidigital number, since it uses as much as digits as its factorization.

1961216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226 (or 212 counting only the distinct ones).

The product of its digits is 648, while the sum is 26.

The square root of 1961216 is about 1400.4342183766. The cubic root of 1961216 is about 125.1723701989.

Subtracting from 1961216 its sum of digits (26), we obtain a triangular number (1961190 = T₁₉₈₀).

The spelling of 1961216 in words is "one million, nine hundred sixty-one thousand, two hundred sixteen".