1428890 has 16 divisors (see below), whose sum is σ = 2632608. Its totient is φ = 558096.

The previous prime is 1428887. The next prime is 1428893. The reversal of 1428890 is 988241.

1428890 = T₂₃₆ + T₂₃₇ + ... + T₂₇₈.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1428887) and next prime (1428893).

It is not an unprimeable number, because it can be changed into a prime (1428893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1232 + ... + 2091.

It is an arithmetic number, because the mean of its divisors is an integer number (164538).

2^1428890 is an apocalyptic number.

1428890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1428890 is a deficient number, since it is larger than the sum of its proper divisors (1203718).

1428890 is a wasteful number, since it uses less digits than its factorization.

1428890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3373.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 1428890 is about 1195.3618698955. The cubic root of 1428890 is about 112.6331591980.

The spelling of 1428890 in words is "one million, four hundred twenty-eight thousand, eight hundred ninety".