252780381 has 24 divisors (see below), whose sum is σ = 421986240. Its totient is φ = 142819776.

The previous prime is 252780379. The next prime is 252780403. The reversal of 252780381 is 183087252.

252780381 is a `hidden beast` number, since 2 + 5 + 278 + 0 + 381 = 666.

It is not a de Polignac number, because 252780381 - 2¹ = 252780379 is a prime.

It is a super-2 number, since 2×252780381² = 127795842037010322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252782381) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16935 + ... + 28148.

It is an arithmetic number, because the mean of its divisors is an integer number (17582760).

Almost surely, 2^252780381 is an apocalyptic number.

252780381 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

252780381 is a deficient number, since it is larger than the sum of its proper divisors (169205859).

252780381 is a wasteful number, since it uses less digits than its factorization.

252780381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45185 (or 45182 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 252780381 is about 15899.0685576231. The cubic root of 252780381 is about 632.2872941072.

The spelling of 252780381 in words is "two hundred fifty-two million, seven hundred eighty thousand, three hundred eighty-one".