1040400169 has 2 divisors, whose sum is σ = 1040400170. Its totient is φ = 1040400168.

The previous prime is 1040400167. The next prime is 1040400173. The reversal of 1040400169 is 9610040401.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 963171225 + 77228944 = 31035^2 + 8788^2 .

It is a cyclic number.

It is not a de Polignac number, because 1040400169 - 2¹ = 1040400167 is a prime.

It is a super-2 number, since 2×1040400169² = 2164865023310457122, which contains 22 as substring.

Together with 1040400167, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1040400167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 520200084 + 520200085.

It is an arithmetic number, because the mean of its divisors is an integer number (520200085).

Almost surely, 2^1040400169 is an apocalyptic number.

It is an amenable number.

1040400169 is a deficient number, since it is larger than the sum of its proper divisors (1).

1040400169 is an equidigital number, since it uses as much as digits as its factorization.

1040400169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1040400169 is about 32255.2347534474. The cubic root of 1040400169 is about 1013.2893342675.

It can be divided in two parts, 1040400 and 169, that multiplied together give a square (175827600 = 13260²).

The spelling of 1040400169 in words is "one billion, forty million, four hundred thousand, one hundred sixty-nine".