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2180942 = 21090471
BaseRepresentation
bin1000010100011101001110
311002210200122
420110131032
51024242232
6114424542
724352301
oct10243516
94083618
102180942
11125a635
12892152
135b48ca
1440ab38
152d1312
hex21474e

2180942 has 4 divisors (see below), whose sum is σ = 3271416. Its totient is φ = 1090470.

The previous prime is 2180923. The next prime is 2180957. The reversal of 2180942 is 2490812.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545234 + ... + 545237.

It is an arithmetic number, because the mean of its divisors is an integer number (817854).

22180942 is an apocalyptic number.

2180942 is a deficient number, since it is larger than the sum of its proper divisors (1090474).

2180942 is a wasteful number, since it uses less digits than its factorization.

2180942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1090473.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 2180942 is about 1476.8012730222. The cubic root of 2180942 is about 129.6824993572.

Subtracting from 2180942 its sum of digits (26), we obtain a triangular number (2180916 = T2088).

The spelling of 2180942 in words is "two million, one hundred eighty thousand, nine hundred forty-two".

Divisors: 1 2 1090471 2180942