345987621 has 72 divisors (see below), whose sum is σ = 627321344. Its totient is φ = 179781120.

The previous prime is 345987619. The next prime is 345987641. The reversal of 345987621 is 126789543.

345987621 is a `hidden beast` number, since 34 + 598 + 7 + 6 + 21 = 666.

It is not a de Polignac number, because 345987621 - 2¹ = 345987619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (345987601) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 564111 + ... + 564723.

Almost surely, 2^345987621 is an apocalyptic number.

345987621 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

345987621 is a deficient number, since it is larger than the sum of its proper divisors (281333723).

345987621 is a wasteful number, since it uses less digits than its factorization.

345987621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691 (or 671 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 345987621 is about 18600.7424851805. The cubic root of 345987621 is about 702.0265227274.

The spelling of 345987621 in words is "three hundred forty-five million, nine hundred eighty-seven thousand, six hundred twenty-one".