1428142638 has 32 divisors (see below), whose sum is σ = 3237897600. Its totient is φ = 416300256.

The previous prime is 1428142633. The next prime is 1428142669. The reversal of 1428142638 is 8362418241.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 1428142596 and 1428142605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1428142631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 480348 + ... + 483311.

It is an arithmetic number, because the mean of its divisors is an integer number (101184300).

Almost surely, 2^1428142638 is an apocalyptic number.

1428142638 is an abundant number, since it is smaller than the sum of its proper divisors (1809754962).

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

1428142638 is a wasteful number, since it uses less digits than its factorization.

1428142638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 963696.

The product of its digits is 73728, while the sum is 39.

The square root of 1428142638 is about 37790.7745091312. The cubic root of 1428142638 is about 1126.1351867909.

The spelling of 1428142638 in words is "one billion, four hundred twenty-eight million, one hundred forty-two thousand, six hundred thirty-eight".