1420865390 has 64 divisors (see below), whose sum is σ = 2964335616. Its totient is φ = 480302592.

The previous prime is 1420865371. The next prime is 1420865441. The reversal of 1420865390 is 935680241.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2079989 + ... + 2080671.

It is an arithmetic number, because the mean of its divisors is an integer number (46317744).

Almost surely, 2^1420865390 is an apocalyptic number.

1420865390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1420865390 is an abundant number, since it is smaller than the sum of its proper divisors (1543470226).

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

1420865390 is a wasteful number, since it uses less digits than its factorization.

1420865390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1073.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 1420865390 is about 37694.3681469792. The cubic root of 1420865390 is about 1124.2191493386.

The spelling of 1420865390 in words is "one billion, four hundred twenty million, eight hundred sixty-five thousand, three hundred ninety".