3402840 has 64 divisors (see below), whose sum is σ = 11669760. Its totient is φ = 777600.

The previous prime is 3402823. The next prime is 3402851. The reversal of 3402840 is 482043.

It is a happy number.

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

It is a congruent number.

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, 1186 + ... + 2865.

It is an arithmetic number, because the mean of its divisors is an integer number (182340).

Almost surely, 2^3402840 is an apocalyptic number.

3402840 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3402840 is an abundant number, since it is smaller than the sum of its proper divisors (8266920).

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

3402840 is a wasteful number, since it uses less digits than its factorization.

3402840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4072 (or 4068 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 3402840 is about 1844.6788338353. The cubic root of 3402840 is about 150.4113155437.

Adding to 3402840 its reverse (482043), we get a palindrome (3884883).

The spelling of 3402840 in words is "three million, four hundred two thousand, eight hundred forty".