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400990 = 2540099
BaseRepresentation
bin1100001111001011110
3202101001111
41201321132
5100312430
612332234
73260032
oct1417136
9671044
10400990
112542a7
1217407a
13110695
14a61c2
157dc2a
hex61e5e

400990 has 8 divisors (see below), whose sum is σ = 721800. Its totient is φ = 160392.

The previous prime is 400963. The next prime is 400997. The reversal of 400990 is 99004.

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

It is an Ulam number.

400990 is a modest number, since divided by 990 gives 40 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400997) by changing a digit.

400990 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20040 + ... + 20059.

It is an arithmetic number, because the mean of its divisors is an integer number (90225).

2400990 is an apocalyptic number.

400990 is a deficient number, since it is larger than the sum of its proper divisors (320810).

400990 is a wasteful number, since it uses less digits than its factorization.

400990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40106.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 400990 is about 633.2377120798. The cubic root of 400990 is about 73.7413664125.

Adding to 400990 its reverse (99004), we get a palindrome (499994).

The spelling of 400990 in words is "four hundred thousand, nine hundred ninety".

Divisors: 1 2 5 10 40099 80198 200495 400990