1421861688 has 160 divisors (see below), whose sum is σ = 4360762560. Its totient is φ = 430168320.

The previous prime is 1421861669. The next prime is 1421861723. The reversal of 1421861688 is 8861681241.

1421861688 is a `hidden beast` number, since 1 + 4 + 21 + 8 + 616 + 8 + 8 = 666.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 512481 + ... + 515247.

It is an arithmetic number, because the mean of its divisors is an integer number (27254766).

Almost surely, 2^1421861688 is an apocalyptic number.

1421861688 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1421861688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2180381280).

1421861688 is an abundant number, since it is smaller than the sum of its proper divisors (2938900872).

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

1421861688 is a wasteful number, since it uses less digits than its factorization.

1421861688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2859 (or 2846 counting only the distinct ones).

The product of its digits is 147456, while the sum is 45.

The square root of 1421861688 is about 37707.5813066816. The cubic root of 1421861688 is about 1124.4818520568.

The spelling of 1421861688 in words is "one billion, four hundred twenty-one million, eight hundred sixty-one thousand, six hundred eighty-eight".