400001395 has 16 divisors (see below), whose sum is σ = 527235840. Its totient is φ = 289976544.

The previous prime is 400001389. The next prime is 400001429. The reversal of 400001395 is 593100004.

It is a cyclic number.

It is not a de Polignac number, because 400001395 - 2³ = 400001387 is a prime.

It is a super-2 number, since 2×400001395² = 320002232003892050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89349 + ... + 93718.

It is an arithmetic number, because the mean of its divisors is an integer number (32952240).

Almost surely, 2^400001395 is an apocalyptic number.

400001395 is a deficient number, since it is larger than the sum of its proper divisors (127234445).

400001395 is a wasteful number, since it uses less digits than its factorization.

400001395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183114.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 400001395 is about 20000.0348749696. The cubic root of 400001395 is about 736.8071562644.

Adding to 400001395 its reverse (593100004), we get a palindrome (993101399).

The spelling of 400001395 in words is "four hundred million, one thousand, three hundred ninety-five".