400000311 has 6 divisors (see below), whose sum is σ = 577778240. Its totient is φ = 266666868.

The previous prime is 400000309. The next prime is 400000333. The reversal of 400000311 is 113000004.

It is not a de Polignac number, because 400000311 - 2¹ = 400000309 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 44444479 = 400000311 / (4 + 0 + 0 + 0 + 0 + 0 + 3 + 1 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400000293 and 400000302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400000301) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22222231 + ... + 22222248.

Almost surely, 2^400000311 is an apocalyptic number.

400000311 is a deficient number, since it is larger than the sum of its proper divisors (177777929).

400000311 is a wasteful number, since it uses less digits than its factorization.

400000311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44444485 (or 44444482 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 400000311 is about 20000.0077749985. The cubic root of 400000311 is about 736.8064906837.

Adding to 400000311 its reverse (113000004), we get a palindrome (513000315).

The spelling of 400000311 in words is "four hundred million, three hundred eleven", and thus it is an aban number.