13405945 has 16 divisors (see below), whose sum is σ = 19467648. Its totient is φ = 8651520.

The previous prime is 13405927. The next prime is 13405957. The reversal of 13405945 is 54950431.

It is not a de Polignac number, because 13405945 - 2⁵ = 13405913 is a prime.

It is a super-2 number, since 2×13405945² = 359438722686050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10671 + ... + 11860.

It is an arithmetic number, because the mean of its divisors is an integer number (1216728).

Almost surely, 2^13405945 is an apocalyptic number.

It is an amenable number.

13405945 is a deficient number, since it is larger than the sum of its proper divisors (6061703).

13405945 is a wasteful number, since it uses less digits than its factorization.

13405945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22560.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 13405945 is about 3661.4129786190. The cubic root of 13405945 is about 237.5558945084. Note that the first 3 decimals are identical.

The spelling of 13405945 in words is "thirteen million, four hundred five thousand, nine hundred forty-five".