1400989 has 2 divisors, whose sum is σ = 1400990. Its totient is φ = 1400988.

The previous prime is 1400947. The next prime is 1401007. The reversal of 1400989 is 9890041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1340964 + 60025 = 1158^2 + 245^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1400989 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1400989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1400939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 700494 + 700495.

It is an arithmetic number, because the mean of its divisors is an integer number (700495).

2^1400989 is an apocalyptic number.

It is an amenable number.

1400989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1400989 is an equidigital number, since it uses as much as digits as its factorization.

1400989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 1400989 is about 1183.6338116157. The cubic root of 1400989 is about 111.8952304686.

The spelling of 1400989 in words is "one million, four hundred thousand, nine hundred eighty-nine".