400006154 has 4 divisors (see below), whose sum is σ = 600009234. Its totient is φ = 200003076.

The previous prime is 400006121. The next prime is 400006177. The reversal of 400006154 is 451600004.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 365842129 + 34164025 = 19127^2 + 5845^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100001537 + ... + 100001540.

Almost surely, 2^400006154 is an apocalyptic number.

400006154 is a deficient number, since it is larger than the sum of its proper divisors (200003080).

400006154 is a wasteful number, since it uses less digits than its factorization.

400006154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200003079.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 400006154 is about 20000.1538494083. The cubic root of 400006154 is about 736.8100782970.

Adding to 400006154 its reverse (451600004), we get a palindrome (851606158).

The spelling of 400006154 in words is "four hundred million, six thousand, one hundred fifty-four".