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1980861 = 31913457
BaseRepresentation
bin111100011100110111101
310201122020020
413203212331
51001341421
6110242353
722560051
oct7434675
93648206
101980861
111133283
127b63b9
1354480c
14397c61
15291dc6
hex1e39bd

1980861 has 8 divisors (see below), whose sum is σ = 2655744. Its totient is φ = 1313280.

The previous prime is 1980859. The next prime is 1980863. The reversal of 1980861 is 1680891.

It is an interprime number because it is at equal distance from previous prime (1980859) and next prime (1980863).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1980861 - 21 = 1980859 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

1980861 is a strobogrammatic number because it is the same when read upside-down.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1980863) 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, 1156 + ... + 2301.

It is an arithmetic number, because the mean of its divisors is an integer number (331968).

21980861 is an apocalyptic number.

It is an amenable number.

1980861 is a deficient number, since it is larger than the sum of its proper divisors (674883).

1980861 is a wasteful number, since it uses less digits than its factorization.

1980861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3651.

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 1980861 is about 1407.4306377225. The cubic root of 1980861 is about 125.5889223397.

The spelling of 1980861 in words is "one million, nine hundred eighty thousand, eight hundred sixty-one".

Divisors: 1 3 191 573 3457 10371 660287 1980861