2061690 has 32 divisors (see below), whose sum is σ = 5209920. Its totient is φ = 520704.

The previous prime is 2061679. The next prime is 2061691. The reversal of 2061690 is 961602.

It is a super-2 number, since 2×2061690² = 8501131312200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2061690.

It is not an unprimeable number, because it can be changed into a prime (2061691) 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, 1239 + ... + 2378.

It is an arithmetic number, because the mean of its divisors is an integer number (162810).

2^2061690 is an apocalyptic number.

2061690 is an abundant number, since it is smaller than the sum of its proper divisors (3148230).

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

2061690 is a wasteful number, since it uses less digits than its factorization.

2061690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3646.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 2061690 is about 1435.8586281386. The cubic root of 2061690 is about 127.2744184995.

It can be divided in two parts, 20616 and 90, that added together give a triangular number (20706 = T₂₀₃).

The spelling of 2061690 in words is "two million, sixty-one thousand, six hundred ninety".