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3780405 = 33541683
BaseRepresentation
bin1110011010111100110101
321010001202000
432122330311
51431433110
6213005513
744063406
oct16327465
97101660
103780405
112152302
121323899
13a24935
147059ad
154ea1c0
hex39af35

3780405 has 32 divisors (see below), whose sum is σ = 6894720. Its totient is φ = 1964160.

The previous prime is 3780397. The next prime is 3780407. The reversal of 3780405 is 5040873.

It is not a de Polignac number, because 3780405 - 23 = 3780397 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3780407) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5194 + ... + 5876.

It is an arithmetic number, because the mean of its divisors is an integer number (215460).

Almost surely, 23780405 is an apocalyptic number.

3780405 is the 1230-th heptagonal number.

It is an amenable number.

3780405 is a deficient number, since it is larger than the sum of its proper divisors (3114315).

3780405 is a wasteful number, since it uses less digits than its factorization.

3780405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738 (or 732 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 3780405 is about 1944.3263614939. The cubic root of 3780405 is about 155.7803862434.

The spelling of 3780405 in words is "three million, seven hundred eighty thousand, four hundred five".

Divisors: 1 3 5 9 15 27 41 45 123 135 205 369 615 683 1107 1845 2049 3415 5535 6147 10245 18441 28003 30735 84009 92205 140015 252027 420045 756081 1260135 3780405