1399724149 has 2 divisors, whose sum is σ = 1399724150. Its totient is φ = 1399724148.

The previous prime is 1399724113. The next prime is 1399724153. The reversal of 1399724149 is 9414279931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 932386225 + 467337924 = 30535^2 + 21618^2 .

It is a cyclic number.

It is not a de Polignac number, because 1399724149 - 2⁷ = 1399724021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1399724749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699862074 + 699862075.

It is an arithmetic number, because the mean of its divisors is an integer number (699862075).

Almost surely, 2^1399724149 is an apocalyptic number.

It is an amenable number.

1399724149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1399724149 is an equidigital number, since it uses as much as digits as its factorization.

1399724149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 49.

The square root of 1399724149 is about 37412.8874720998. The cubic root of 1399724149 is about 1118.6154630972.

The spelling of 1399724149 in words is "one billion, three hundred ninety-nine million, seven hundred twenty-four thousand, one hundred forty-nine".