1400897891 has 2 divisors, whose sum is σ = 1400897892. Its totient is φ = 1400897890.

The previous prime is 1400897831. The next prime is 1400897899. The reversal of 1400897891 is 1987980041.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1400897891 - 2¹⁰ = 1400896867 is a prime.

It is not a weakly prime, because it can be changed into another prime (1400897899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 700448945 + 700448946.

It is an arithmetic number, because the mean of its divisors is an integer number (700448946).

Almost surely, 2^1400897891 is an apocalyptic number.

1400897891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1400897891 is an equidigital number, since it uses as much as digits as its factorization.

1400897891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 47.

The square root of 1400897891 is about 37428.5705177208. The cubic root of 1400897891 is about 1118.9280482891.

The spelling of 1400897891 in words is "one billion, four hundred million, eight hundred ninety-seven thousand, eight hundred ninety-one".