3400728 has 16 divisors (see below), whose sum is σ = 8501880. Its totient is φ = 1133568.

The previous prime is 3400717. The next prime is 3400739. The reversal of 3400728 is 8270043.

It is an interprime number because it is at equal distance from previous prime (3400717) and next prime (3400739).

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 141697 = 3400728 / (3 + 4 + 0 + 0 + 7 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 3400698 and 3400707.

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, 70825 + ... + 70872.

Almost surely, 2^3400728 is an apocalyptic number.

It is an amenable number.

3400728 is an abundant number, since it is smaller than the sum of its proper divisors (5101152).

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

3400728 is a wasteful number, since it uses less digits than its factorization.

3400728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141706 (or 141702 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 3400728 is about 1844.1062876093. The cubic root of 3400728 is about 150.3801911062.

The spelling of 3400728 in words is "three million, four hundred thousand, seven hundred twenty-eight".