400115644 has 6 divisors (see below), whose sum is σ = 700202384. Its totient is φ = 200057820.

The previous prime is 400115629. The next prime is 400115647. The reversal of 400115644 is 446511004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400115647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50014452 + ... + 50014459.

Almost surely, 2^400115644 is an apocalyptic number.

It is an amenable number.

400115644 is a deficient number, since it is larger than the sum of its proper divisors (300086740).

400115644 is a wasteful number, since it uses less digits than its factorization.

400115644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100028915 (or 100028913 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 400115644 is about 20002.8908910687. The cubic root of 400115644 is about 736.8772989094.

Adding to 400115644 its reverse (446511004), we get a palindrome (846626648).

The spelling of 400115644 in words is "four hundred million, one hundred fifteen thousand, six hundred forty-four".