146821690 has 32 divisors (see below), whose sum is σ = 281658384. Its totient is φ = 54912000.

The previous prime is 146821687. The next prime is 146821699. The reversal of 146821690 is 96128641.

It is a happy number.

It is a Cunningham number, because it is equal to 12117²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 114297481 + 32524209 = 10691^2 + 5703^2 .

It is a super-2 number, since 2×146821690² = 43113217308912200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (146821699) 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, 23940 + ... + 29440.

Almost surely, 2^146821690 is an apocalyptic number.

146821690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

146821690 is a deficient number, since it is larger than the sum of its proper divisors (134836694).

146821690 is a wasteful number, since it uses less digits than its factorization.

146821690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5682.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 146821690 is about 12117.0000412643. Note that the first 4 decimals coincide. The cubic root of 146821690 is about 527.5497313909.

The spelling of 146821690 in words is "one hundred forty-six million, eight hundred twenty-one thousand, six hundred ninety".