101400644 has 24 divisors (see below), whose sum is σ = 187256160. Its totient is φ = 47912256.

The previous prime is 101400619. The next prime is 101400647. The reversal of 101400644 is 446004101.

It is a happy number.

It is a super-2 number, since 2×101400644² = 20564181207229472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (101400647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34064 + ... + 36920.

It is an arithmetic number, because the mean of its divisors is an integer number (7802340).

Almost surely, 2^101400644 is an apocalyptic number.

It is an amenable number.

101400644 is a deficient number, since it is larger than the sum of its proper divisors (85855516).

101400644 is a wasteful number, since it uses less digits than its factorization.

101400644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3347 (or 3345 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 101400644 is about 10069.7886770279. The cubic root of 101400644 is about 466.3159148952.

Adding to 101400644 its reverse (446004101), we get a palindrome (547404745).

The spelling of 101400644 in words is "one hundred one million, four hundred thousand, six hundred forty-four".