1428690 has 16 divisors (see below), whose sum is σ = 3428928. Its totient is φ = 380976.

The previous prime is 1428689. The next prime is 1428703. The reversal of 1428690 is 968241.

It is a super-2 number, since 2×1428690² = 4082310232200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 47623 = 1428690 / (1 + 4 + 2 + 8 + 6 + 9 + 0).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23782 + ... + 23841.

It is an arithmetic number, because the mean of its divisors is an integer number (214308).

2^1428690 is an apocalyptic number.

1428690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1428690 is an abundant number, since it is smaller than the sum of its proper divisors (2000238).

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

1428690 is a wasteful number, since it uses less digits than its factorization.

1428690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47633.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 1428690 is about 1195.2782102925. The cubic root of 1428690 is about 112.6279039106.

The spelling of 1428690 in words is "one million, four hundred twenty-eight thousand, six hundred ninety".