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400388 = 22199503
BaseRepresentation
bin1100001110000000100
3202100020012
41201300010
5100303023
612325352
73255212
oct1416004
9670205
10400388
112538aa
12173858
13110321
14a5cb2
157d978
hex61c04

400388 has 12 divisors (see below), whose sum is σ = 705600. Its totient is φ = 198792.

The previous prime is 400381. The next prime is 400391. The reversal of 400388 is 883004.

It is not an unprimeable number, because it can be changed into a prime (400381) by changing a digit.

400388 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 3 ways as a sum of consecutive naturals, for example, 545 + ... + 1047.

It is an arithmetic number, because the mean of its divisors is an integer number (58800).

2400388 is an apocalyptic number.

It is an amenable number.

400388 is a deficient number, since it is larger than the sum of its proper divisors (305212).

400388 is a wasteful number, since it uses less digits than its factorization.

400388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 706 (or 704 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 400388 is about 632.7621986181. The cubic root of 400388 is about 73.7044456777.

The spelling of 400388 in words is "four hundred thousand, three hundred eighty-eight".

Divisors: 1 2 4 199 398 503 796 1006 2012 100097 200194 400388