400238145 has 16 divisors (see below), whose sum is σ = 711534720. Its totient is φ = 213460272.

The previous prime is 400238119. The next prime is 400238149. The reversal of 400238145 is 541832004.

It is not a de Polignac number, because 400238145 - 2¹¹ = 400236097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (400238149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1482229 + ... + 1482498.

It is an arithmetic number, because the mean of its divisors is an integer number (44470920).

Almost surely, 2^400238145 is an apocalyptic number.

400238145 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

400238145 is a deficient number, since it is larger than the sum of its proper divisors (311296575).

400238145 is a wasteful number, since it uses less digits than its factorization.

400238145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2964741 (or 2964735 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 400238145 is about 20005.9527391224. The cubic root of 400238145 is about 736.9524929995.

The spelling of 400238145 in words is "four hundred million, two hundred thirty-eight thousand, one hundred forty-five".