117021428 has 12 divisors (see below), whose sum is σ = 206815812. Its totient is φ = 57931200.

The previous prime is 117021413. The next prime is 117021439. The reversal of 117021428 is 824120711.

It can be written as a sum of positive squares in 2 ways, for example, as 78357904 + 38663524 = 8852^2 + 6218^2 .

It is a super-2 number, since 2×117021428² = 27388029222318368, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 117021397 and 117021406.

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 3 ways as a sum of consecutive naturals, for example, 144425 + ... + 145232.

It is an arithmetic number, because the mean of its divisors is an integer number (17234651).

Almost surely, 2^117021428 is an apocalyptic number.

It is an amenable number.

117021428 is a deficient number, since it is larger than the sum of its proper divisors (89794384).

117021428 is a wasteful number, since it uses less digits than its factorization.

117021428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289762 (or 289760 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 26.

The square root of 117021428 is about 10817.6442906947. The cubic root of 117021428 is about 489.1271814535.

The spelling of 117021428 in words is "one hundred seventeen million, twenty-one thousand, four hundred twenty-eight".