1406289991 has 2 divisors, whose sum is σ = 1406289992. Its totient is φ = 1406289990.

The previous prime is 1406289967. The next prime is 1406290009. The reversal of 1406289991 is 1999826041.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1406289991 - 2¹⁹ = 1405765703 is a prime.

It is a super-3 number, since 3×1406289991³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1406289091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 703144995 + 703144996.

It is an arithmetic number, because the mean of its divisors is an integer number (703144996).

Almost surely, 2^1406289991 is an apocalyptic number.

1406289991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1406289991 is an equidigital number, since it uses as much as digits as its factorization.

1406289991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 49.

The square root of 1406289991 is about 37500.5332095425. The cubic root of 1406289991 is about 1120.3618067376.

The spelling of 1406289991 in words is "one billion, four hundred six million, two hundred eighty-nine thousand, nine hundred ninety-one".