Search a number
-
+
400690 = 25172357
BaseRepresentation
bin1100001110100110010
3202100122101
41201310302
5100310230
612331014
73256123
oct1416462
9670571
10400690
11254054
12173a6a
131104c4
14a604a
157daca
hex61d32

400690 has 16 divisors (see below), whose sum is σ = 763992. Its totient is φ = 150784.

The previous prime is 400681. The next prime is 400703. The reversal of 400690 is 96004.

It is a happy number.

400690 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 6332+1.

It can be written as a sum of positive squares in 4 ways, for example, as 312481 + 88209 = 559^2 + 297^2 .

It is a super-2 number, since 2×4006902 = 321104952200, which contains 22 as substring.

It is an unprimeable number.

400690 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1009 + ... + 1348.

2400690 is an apocalyptic number.

400690 is a deficient number, since it is larger than the sum of its proper divisors (363302).

400690 is a wasteful number, since it uses less digits than its factorization.

400690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2381.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 400690 is about 633.0007898889. Note that the first 3 decimals coincide. The cubic root of 400690 is about 73.7229719977.

Adding to 400690 its reverse (96004), we get a palindrome (496694).

It can be divided in two parts, 4006 and 90, that added together give a 12-th power (4096 = 212).

The spelling of 400690 in words is "four hundred thousand, six hundred ninety".

Divisors: 1 2 5 10 17 34 85 170 2357 4714 11785 23570 40069 80138 200345 400690