102455440 has 20 divisors (see below), whose sum is σ = 238209084. Its totient is φ = 40982144.

The previous prime is 102455411. The next prime is 102455461. The reversal of 102455440 is 44554201.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 58736896 + 43718544 = 7664^2 + 6612^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 640267 + ... + 640426.

Almost surely, 2^102455440 is an apocalyptic number.

102455440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102455440 is an abundant number, since it is smaller than the sum of its proper divisors (135753644).

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

102455440 is a wasteful number, since it uses less digits than its factorization.

102455440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1280706 (or 1280700 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 102455440 is about 10122.0274648906. The cubic root of 102455440 is about 467.9272538937.

The spelling of 102455440 in words is "one hundred two million, four hundred fifty-five thousand, four hundred forty".