100040780 has 24 divisors (see below), whose sum is σ = 240098208. Its totient is φ = 34299648.

The previous prime is 100040741. The next prime is 100040789. The reversal of 100040780 is 87040001.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (100040789) 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, 357149 + ... + 357428.

It is an arithmetic number, because the mean of its divisors is an integer number (10004092).

Almost surely, 2^100040780 is an apocalyptic number.

100040780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100040780 is an abundant number, since it is smaller than the sum of its proper divisors (140057428).

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

100040780 is a wasteful number, since it uses less digits than its factorization.

100040780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714593 (or 714591 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 100040780 is about 10002.0387921663. The cubic root of 100040780 is about 464.2219694508.

Adding to 100040780 its reverse (87040001), we get a palindrome (187080781).

The spelling of 100040780 in words is "one hundred million, forty thousand, seven hundred eighty".