1961890 has 16 divisors (see below), whose sum is σ = 4036032. Its totient is φ = 672624.

The previous prime is 1961887. The next prime is 1961893. The reversal of 1961890 is 981691.

It is an interprime number because it is at equal distance from previous prime (1961887) and next prime (1961893).

It is not an unprimeable number, because it can be changed into a prime (1961893) 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, 13944 + ... + 14083.

It is an arithmetic number, because the mean of its divisors is an integer number (252252).

2^1961890 is an apocalyptic number.

1961890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1961890 is an abundant number, since it is smaller than the sum of its proper divisors (2074142).

1961890 is a wasteful number, since it uses less digits than its factorization.

1961890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28041.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 1961890 is about 1400.6748373552. The cubic root of 1961890 is about 125.1867076498.

The spelling of 1961890 in words is "one million, nine hundred sixty-one thousand, eight hundred ninety".