1871961 has 16 divisors (see below), whose sum is σ = 3072384. Its totient is φ = 987264.

The previous prime is 1871957. The next prime is 1871981. The reversal of 1871961 is 1691781.

1871961 = 96² + 97² + ... + 186².

It is not a de Polignac number, because 1871961 - 2² = 1871957 is a prime.

1871961 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1871951) 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, 3156 + ... + 3701.

It is an arithmetic number, because the mean of its divisors is an integer number (192024).

2^1871961 is an apocalyptic number.

It is an amenable number.

1871961 is a deficient number, since it is larger than the sum of its proper divisors (1200423).

1871961 is a wasteful number, since it uses less digits than its factorization.

1871961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6880.

The product of its digits is 3024, while the sum is 33.

The square root of 1871961 is about 1368.1962578519. The cubic root of 1871961 is about 123.2439470823.

The spelling of 1871961 in words is "one million, eight hundred seventy-one thousand, nine hundred sixty-one".