402834781 has 2 divisors, whose sum is σ = 402834782. Its totient is φ = 402834780.

The previous prime is 402834749. The next prime is 402834787. The reversal of 402834781 is 187438204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 387105625 + 15729156 = 19675^2 + 3966^2 .

It is a cyclic number.

It is not a de Polignac number, because 402834781 - 2⁵ = 402834749 is a prime.

It is a super-2 number, since 2×402834781² = 324551721566635922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 402834781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402834787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201417390 + 201417391.

It is an arithmetic number, because the mean of its divisors is an integer number (201417391).

Almost surely, 2^402834781 is an apocalyptic number.

It is an amenable number.

402834781 is a deficient number, since it is larger than the sum of its proper divisors (1).

402834781 is an equidigital number, since it uses as much as digits as its factorization.

402834781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43008, while the sum is 37.

The square root of 402834781 is about 20070.7444057265. The cubic root of 402834781 is about 738.5427744769.

It can be divided in two parts, 4028 and 34781, that added together give a square (38809 = 197²).

The spelling of 402834781 in words is "four hundred two million, eight hundred thirty-four thousand, seven hundred eighty-one".