1420389 has 16 divisors (see below), whose sum is σ = 2173440. Its totient is φ = 915840.

The previous prime is 1420373. The next prime is 1420399. The reversal of 1420389 is 9830241.

It is not a de Polignac number, because 1420389 - 2⁴ = 1420373 is a prime.

It is a super-2 number, since 2×1420389² = 4035009822642, which contains 22 as substring.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1420369) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 12 + ... + 1685.

It is an arithmetic number, because the mean of its divisors is an integer number (135840).

2^1420389 is an apocalyptic number.

It is an amenable number.

1420389 is a deficient number, since it is larger than the sum of its proper divisors (753051).

1420389 is a wasteful number, since it uses less digits than its factorization.

1420389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1737 (or 1731 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 1420389 is about 1191.8007383787. The cubic root of 1420389 is about 112.4093491968.

The spelling of 1420389 in words is "one million, four hundred twenty thousand, three hundred eighty-nine".