1623420261 has 12 divisors (see below), whose sum is σ = 2425800780. Its totient is φ = 1044960000.

The previous prime is 1623420257. The next prime is 1623420301. The reversal of 1623420261 is 1620243261.

1623420261 is a `hidden beast` number, since 1 + 62 + 342 + 0 + 261 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 866124900 + 757295361 = 29430^2 + 27519^2 .

It is not a de Polignac number, because 1623420261 - 2² = 1623420257 is a prime.

It is a super-3 number, since 3×1623420261³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1623420221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3109740 + ... + 3110261.

It is an arithmetic number, because the mean of its divisors is an integer number (202150065).

Almost surely, 2^1623420261 is an apocalyptic number.

It is an amenable number.

1623420261 is a deficient number, since it is larger than the sum of its proper divisors (802380519).

1623420261 is a wasteful number, since it uses less digits than its factorization.

1623420261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6220036 (or 6220033 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 1623420261 is about 40291.6897262947. The cubic root of 1623420261 is about 1175.2862464822.

The spelling of 1623420261 in words is "one billion, six hundred twenty-three million, four hundred twenty thousand, two hundred sixty-one".