400121030 has 32 divisors (see below), whose sum is σ = 753677568. Its totient is φ = 152755200.

The previous prime is 400121003. The next prime is 400121039. The reversal of 400121030 is 30121004.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400121039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13790 + ... + 31470.

It is an arithmetic number, because the mean of its divisors is an integer number (23552424).

Almost surely, 2^400121030 is an apocalyptic number.

400121030 is a deficient number, since it is larger than the sum of its proper divisors (353556538).

400121030 is a wasteful number, since it uses less digits than its factorization.

400121030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17792.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 400121030 is about 20003.0255211555. The cubic root of 400121030 is about 736.8806052896.

Adding to 400121030 its reverse (30121004), we get a palindrome (430242034).

The spelling of 400121030 in words is "four hundred million, one hundred twenty-one thousand, thirty".