402003961 has 2 divisors, whose sum is σ = 402003962. Its totient is φ = 402003960.

The previous prime is 402003949. The next prime is 402003983. The reversal of 402003961 is 169300204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 264387600 + 137616361 = 16260^2 + 11731^2 .

It is a cyclic number.

It is not a de Polignac number, because 402003961 - 2⁵ = 402003929 is a prime.

It is not a weakly prime, because it can be changed into another prime (402003991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201001980 + 201001981.

It is an arithmetic number, because the mean of its divisors is an integer number (201001981).

Almost surely, 2^402003961 is an apocalyptic number.

It is an amenable number.

402003961 is a deficient number, since it is larger than the sum of its proper divisors (1).

402003961 is an equidigital number, since it uses as much as digits as its factorization.

402003961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 402003961 is about 20050.0364338821. The cubic root of 402003961 is about 738.0346932034.

The spelling of 402003961 in words is "four hundred two million, three thousand, nine hundred sixty-one".