345621969 has 24 divisors (see below), whose sum is σ = 622420032. Its totient is φ = 179543520.

The previous prime is 345621929. The next prime is 345622033. The reversal of 345621969 is 969126543.

345621969 is a `hidden beast` number, since 3 + 456 + 2 + 196 + 9 = 666.

It is not a de Polignac number, because 345621969 - 2¹² = 345617873 is a prime.

It is a super-2 number, since 2×345621969² = 238909090910873922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (345621929) 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, 248674 + ... + 250059.

It is an arithmetic number, because the mean of its divisors is an integer number (25934168).

Almost surely, 2^345621969 is an apocalyptic number.

It is an amenable number.

345621969 is a deficient number, since it is larger than the sum of its proper divisors (276798063).

345621969 is a wasteful number, since it uses less digits than its factorization.

345621969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498757 (or 498754 counting only the distinct ones).

The product of its digits is 349920, while the sum is 45.

The square root of 345621969 is about 18590.9109244276. The cubic root of 345621969 is about 701.7791267046.

It can be divided in two parts, 3456 and 21969, that added together give a triangular number (25425 = T₂₂₅).

The spelling of 345621969 in words is "three hundred forty-five million, six hundred twenty-one thousand, nine hundred sixty-nine".