402003631 has 4 divisors (see below), whose sum is σ = 412868632. Its totient is φ = 391138632.

The previous prime is 402003617. The next prime is 402003649. The reversal of 402003631 is 136300204.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 402003631 - 2¹³ = 401995439 is a prime.

It is a super-2 number, since 2×402003631² = 323213838674368322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 402003599 and 402003608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402003031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5432445 + ... + 5432518.

It is an arithmetic number, because the mean of its divisors is an integer number (103217158).

Almost surely, 2^402003631 is an apocalyptic number.

402003631 is a deficient number, since it is larger than the sum of its proper divisors (10865001).

402003631 is a wasteful number, since it uses less digits than its factorization.

402003631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10865000.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 402003631 is about 20050.0282044689. The cubic root of 402003631 is about 738.0344912555.

Adding to 402003631 its reverse (136300204), we get a palindrome (538303835).

The spelling of 402003631 in words is "four hundred two million, three thousand, six hundred thirty-one".