101640040 has 16 divisors (see below), whose sum is σ = 228690180. Its totient is φ = 40656000.

The previous prime is 101640031. The next prime is 101640043. The reversal of 101640040 is 40046101.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 100520676 + 1119364 = 10026^2 + 1058^2 .

It is a junction number, because it is equal to n+sod(n) for n = 101639996 and 101640023.

It is not an unprimeable number, because it can be changed into a prime (101640043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1270461 + ... + 1270540.

Almost surely, 2^101640040 is an apocalyptic number.

101640040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101640040 is an abundant number, since it is smaller than the sum of its proper divisors (127050140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

101640040 is a wasteful number, since it uses less digits than its factorization.

101640040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2541012 (or 2541008 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 101640040 is about 10081.6685127017. The cubic root of 101640040 is about 466.6826003630.

Adding to 101640040 its reverse (40046101), we get a palindrome (141686141).

The spelling of 101640040 in words is "one hundred one million, six hundred forty thousand, forty".