345120381 has 6 divisors (see below), whose sum is σ = 498507230. Its totient is φ = 230080248.

The previous prime is 345120379. The next prime is 345120401. The reversal of 345120381 is 183021543.

It is a happy number.

345120381 is a `hidden beast` number, since 3 + 451 + 203 + 8 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 312971481 + 32148900 = 17691^2 + 5670^2 .

It is not a de Polignac number, because 345120381 - 2¹ = 345120379 is a prime.

It is a super-2 number, since 2×345120381² = 238216154763170322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (345120311) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19173346 + ... + 19173363.

Almost surely, 2^345120381 is an apocalyptic number.

It is an amenable number.

345120381 is a deficient number, since it is larger than the sum of its proper divisors (153386849).

345120381 is a wasteful number, since it uses less digits than its factorization.

345120381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38346715 (or 38346712 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 345120381 is about 18577.4158859622. The cubic root of 345120381 is about 701.4394739038.

It can be divided in two parts, 3451 and 20381, that added together give a palindrome (23832).

The spelling of 345120381 in words is "three hundred forty-five million, one hundred twenty thousand, three hundred eighty-one".