1399397841 has 6 divisors (see below), whose sum is σ = 2021352450. Its totient is φ = 932931888.

The previous prime is 1399397833. The next prime is 1399397843. The reversal of 1399397841 is 1487939931.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1245737025 + 153660816 = 35295^2 + 12396^2 .

It is not a de Polignac number, because 1399397841 - 2³ = 1399397833 is a prime.

It is a super-2 number, since 2×1399397841² = 3916628634790922562, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1399397843) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 77744316 + ... + 77744333.

It is an arithmetic number, because the mean of its divisors is an integer number (336892075).

Almost surely, 2^1399397841 is an apocalyptic number.

It is an amenable number.

1399397841 is a deficient number, since it is larger than the sum of its proper divisors (621954609).

1399397841 is a wasteful number, since it uses less digits than its factorization.

1399397841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155488655 (or 155488652 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 54.

The square root of 1399397841 is about 37408.5263141974. The cubic root of 1399397841 is about 1118.5285313155.

The spelling of 1399397841 in words is "one billion, three hundred ninety-nine million, three hundred ninety-seven thousand, eight hundred forty-one".