400115554 has 8 divisors (see below), whose sum is σ = 600378588. Its totient is φ = 199989360.

The previous prime is 400115539. The next prime is 400115561. The reversal of 400115554 is 455511004.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 286117225 + 113998329 = 16915^2 + 10677^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26557 + ... + 38800.

Almost surely, 2^400115554 is an apocalyptic number.

400115554 is a deficient number, since it is larger than the sum of its proper divisors (200263034).

400115554 is a wasteful number, since it uses less digits than its factorization.

400115554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68420.

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 400115554 is about 20002.8886413938. Note that the first 3 decimals coincide. The cubic root of 400115554 is about 736.8772436596.

Adding to 400115554 its reverse (455511004), we get a palindrome (855626558).

The spelling of 400115554 in words is "four hundred million, one hundred fifteen thousand, five hundred fifty-four".