1400478889 has 2 divisors, whose sum is σ = 1400478890. Its totient is φ = 1400478888.

The previous prime is 1400478851. The next prime is 1400478907. The reversal of 1400478889 is 9888740041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1239392025 + 161086864 = 35205^2 + 12692^2 .

It is a cyclic number.

It is not a de Polignac number, because 1400478889 - 2¹⁵ = 1400446121 is a prime.

It is a super-2 number, since 2×1400478889² = 3922682237069348642, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1400478839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 700239444 + 700239445.

It is an arithmetic number, because the mean of its divisors is an integer number (700239445).

Almost surely, 2^1400478889 is an apocalyptic number.

It is an amenable number.

1400478889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1400478889 is an equidigital number, since it uses as much as digits as its factorization.

1400478889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 516096, while the sum is 49.

The square root of 1400478889 is about 37422.9727440245. The cubic root of 1400478889 is about 1118.8164817852.

The spelling of 1400478889 in words is "one billion, four hundred million, four hundred seventy-eight thousand, eight hundred eighty-nine".