4013945 has 16 divisors (see below), whose sum is σ = 5330640. Its totient is φ = 2882304.

The previous prime is 4013939. The next prime is 4013951. The reversal of 4013945 is 5493104.

It is an interprime number because it is at equal distance from previous prime (4013939) and next prime (4013951).

It can be written as a sum of positive squares in 8 ways, for example, as 1936 + 4012009 = 44^2 + 2003^2 .

It is a cyclic number.

It is not a de Polignac number, because 4013945 - 2⁴ = 4013929 is a prime.

It is a super-2 number, since 2×4013945² = 32223508926050, which contains 22 as substring.

It is a Curzon 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, 1571 + ... + 3239.

It is an arithmetic number, because the mean of its divisors is an integer number (333165).

Almost surely, 2^4013945 is an apocalyptic number.

It is an amenable number.

4013945 is a deficient number, since it is larger than the sum of its proper divisors (1316695).

4013945 is a wasteful number, since it uses less digits than its factorization.

4013945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1724.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 4013945 is about 2003.4832168002. The cubic root of 4013945 is about 158.9243604730.

The spelling of 4013945 in words is "four million, thirteen thousand, nine hundred forty-five".