1285740 has 48 divisors (see below), whose sum is σ = 4001760. Its totient is φ = 342720.

The previous prime is 1285717. The next prime is 1285741. The reversal of 1285740 is 475821.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1285741) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 651 + ... + 1730.

It is an arithmetic number, because the mean of its divisors is an integer number (83370).

2^1285740 is an apocalyptic number.

1285740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1285740 is an abundant number, since it is smaller than the sum of its proper divisors (2716020).

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

1285740 is a wasteful number, since it uses less digits than its factorization.

1285740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2399 (or 2391 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 1285740 is about 1133.9047579052. The cubic root of 1285740 is about 108.7387622157.

It can be divided in two parts, 1285 and 740, that added together give a square (2025 = 45²).

The spelling of 1285740 in words is "one million, two hundred eighty-five thousand, seven hundred forty".