4007961 has 10 divisors (see below), whose sum is σ = 5987322. Its totient is φ = 2671920.

The previous prime is 4007953. The next prime is 4007963. The reversal of 4007961 is 1697004.

It can be written as a sum of positive squares in only one way, i.e., 2742336 + 1265625 = 1656^2 + 1125^2 .

It is not a de Polignac number, because 4007961 - 2³ = 4007953 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4007963) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 24660 + ... + 24821.

Almost surely, 2^4007961 is an apocalyptic number.

It is an amenable number.

4007961 is a deficient number, since it is larger than the sum of its proper divisors (1979361).

4007961 is an equidigital number, since it uses as much as digits as its factorization.

4007961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49493 (or 49484 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 4007961 is about 2001.9892607105. The cubic root of 4007961 is about 158.8453462405.

The spelling of 4007961 in words is "four million, seven thousand, nine hundred sixty-one".