1405088891 has 2 divisors, whose sum is σ = 1405088892. Its totient is φ = 1405088890.

The previous prime is 1405088863. The next prime is 1405088899. The reversal of 1405088891 is 1988805041.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1405088891 - 2²² = 1400894587 is a prime.

It is a super-2 number, since 2×1405088891² = 3948549583223219762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1405088899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 702544445 + 702544446.

It is an arithmetic number, because the mean of its divisors is an integer number (702544446).

Almost surely, 2^1405088891 is an apocalyptic number.

1405088891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1405088891 is an equidigital number, since it uses as much as digits as its factorization.

1405088891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 92160, while the sum is 44.

The square root of 1405088891 is about 37484.5153496747. The cubic root of 1405088891 is about 1120.0427521414.

The spelling of 1405088891 in words is "one billion, four hundred five million, eighty-eight thousand, eight hundred ninety-one".