13905945 has 16 divisors (see below), whose sum is σ = 24721920. Its totient is φ = 7416432.

The previous prime is 13905943. The next prime is 13905953. The reversal of 13905945 is 54950931.

13905945 = T₅₄₅ + T₅₄₆ + ... + T₆₂₅.

It is not a de Polignac number, because 13905945 - 2¹ = 13905943 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13905943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51369 + ... + 51638.

It is an arithmetic number, because the mean of its divisors is an integer number (1545120).

Almost surely, 2^13905945 is an apocalyptic number.

13905945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13905945 is a deficient number, since it is larger than the sum of its proper divisors (10815975).

13905945 is a wasteful number, since it uses less digits than its factorization.

13905945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103021 (or 103015 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 36.

The square root of 13905945 is about 3729.0675778269. The cubic root of 13905945 is about 240.4732848094.

The spelling of 13905945 in words is "thirteen million, nine hundred five thousand, nine hundred forty-five".