2145405236 has 48 divisors (see below), whose sum is σ = 4323669840. Its totient is φ = 922675200.

The previous prime is 2145405233. The next prime is 2145405271. The reversal of 2145405236 is 6325045412.

It can be written as a sum of positive squares in 8 ways, for example, as 734952100 + 1410453136 = 27110^2 + 37556^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145405233) 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, 77270 + ... + 101298.

It is an arithmetic number, because the mean of its divisors is an integer number (90076455).

Almost surely, 2^2145405236 is an apocalyptic number.

2145405236 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

2145405236 is an abundant number, since it is smaller than the sum of its proper divisors (2178264604).

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

2145405236 is a wasteful number, since it uses less digits than its factorization.

2145405236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24164 (or 24162 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 32.

The square root of 2145405236 is about 46318.5193632094. The cubic root of 2145405236 is about 1289.7427999137.

The spelling of 2145405236 in words is "two billion, one hundred forty-five million, four hundred five thousand, two hundred thirty-six".