102155340 has 48 divisors (see below), whose sum is σ = 326898432. Its totient is φ = 23349696.

The previous prime is 102155311. The next prime is 102155341. The reversal of 102155340 is 43551201.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (102155341) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 121194 + ... + 122033.

It is an arithmetic number, because the mean of its divisors is an integer number (6810384).

Almost surely, 2^102155340 is an apocalyptic number.

102155340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102155340 is an abundant number, since it is smaller than the sum of its proper divisors (224743092).

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

102155340 is a wasteful number, since it uses less digits than its factorization.

102155340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243246 (or 243244 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 102155340 is about 10107.1924885202. The cubic root of 102155340 is about 467.4699419225.

The spelling of 102155340 in words is "one hundred two million, one hundred fifty-five thousand, three hundred forty".