128240940 has 48 divisors (see below), whose sum is σ = 359704800. Its totient is φ = 34137600.

The previous prime is 128240933. The next prime is 128240993. The reversal of 128240940 is 49042821.

128240940 = 1771² + 1772² + ... + 1810².

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 128240898 and 128240907.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40536 + ... + 43584.

It is an arithmetic number, because the mean of its divisors is an integer number (7493850).

Almost surely, 2^128240940 is an apocalyptic number.

128240940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128240940 is an abundant number, since it is smaller than the sum of its proper divisors (231463860).

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

128240940 is a wasteful number, since it uses less digits than its factorization.

128240940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3762 (or 3760 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 128240940 is about 11324.3516370696. The cubic root of 128240940 is about 504.2844356926.

The spelling of 128240940 in words is "one hundred twenty-eight million, two hundred forty thousand, nine hundred forty".