102015440 has 20 divisors (see below), whose sum is σ = 237186084. Its totient is φ = 40806144.

The previous prime is 102015439. The next prime is 102015461. The reversal of 102015440 is 44510201.

It can be written as a sum of positive squares in 2 ways, for example, as 77651344 + 24364096 = 8812^2 + 4936^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 637517 + ... + 637676.

Almost surely, 2^102015440 is an apocalyptic number.

102015440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102015440 is an abundant number, since it is smaller than the sum of its proper divisors (135170644).

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

102015440 is a wasteful number, since it uses less digits than its factorization.

102015440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1275206 (or 1275200 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 102015440 is about 10100.2693033404. The cubic root of 102015440 is about 467.2564470564.

Adding to 102015440 its reverse (44510201), we get a palindrome (146525641).

The spelling of 102015440 in words is "one hundred two million, fifteen thousand, four hundred forty".