1951616 has 32 divisors (see below), whose sum is σ = 3957600. Its totient is φ = 958464.

The previous prime is 1951603. The next prime is 1951627. The reversal of 1951616 is 6161591.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×1951616² = 7617610022912, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10016 + ... + 10208.

It is an arithmetic number, because the mean of its divisors is an integer number (123675).

2^1951616 is an apocalyptic number.

1951616 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 1951616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1978800).

1951616 is an abundant number, since it is smaller than the sum of its proper divisors (2005984).

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

1951616 is an equidigital number, since it uses as much as digits as its factorization.

1951616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286 (or 274 counting only the distinct ones).

The product of its digits is 1620, while the sum is 29.

The square root of 1951616 is about 1397.0025053664. The cubic root of 1951616 is about 124.9677997058.

The spelling of 1951616 in words is "one million, nine hundred fifty-one thousand, six hundred sixteen".