400834981 has 2 divisors, whose sum is σ = 400834982. Its totient is φ = 400834980.

The previous prime is 400834939. The next prime is 400835041. The reversal of 400834981 is 189438004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 313113025 + 87721956 = 17695^2 + 9366^2 .

It is a cyclic number.

It is not a de Polignac number, because 400834981 - 2⁷ = 400834853 is a prime.

It is a super-2 number, since 2×400834981² = 321337363986540722, 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 400834981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400834921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200417490 + 200417491.

It is an arithmetic number, because the mean of its divisors is an integer number (200417491).

Almost surely, 2^400834981 is an apocalyptic number.

It is an amenable number.

400834981 is a deficient number, since it is larger than the sum of its proper divisors (1).

400834981 is an equidigital number, since it uses as much as digits as its factorization.

400834981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 400834981 is about 20020.8636427103. The cubic root of 400834981 is about 737.3186261251.

The spelling of 400834981 in words is "four hundred million, eight hundred thirty-four thousand, nine hundred eighty-one".