400121404 has 24 divisors (see below), whose sum is σ = 721532448. Its totient is φ = 194005440.

The previous prime is 400121377. The next prime is 400121417. The reversal of 400121404 is 404121004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41682 + ... + 50374.

It is an arithmetic number, because the mean of its divisors is an integer number (30063852).

Almost surely, 2^400121404 is an apocalyptic number.

It is an amenable number.

400121404 is a deficient number, since it is larger than the sum of its proper divisors (321411044).

400121404 is a wasteful number, since it uses less digits than its factorization.

400121404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9045 (or 9043 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 400121404 is about 20003.0348697391. The cubic root of 400121404 is about 736.8808348812.

Adding to 400121404 its reverse (404121004), we get a palindrome (804242408).

The spelling of 400121404 in words is "four hundred million, one hundred twenty-one thousand, four hundred four".