1399406938 has 8 divisors (see below), whose sum is σ = 2105126100. Its totient is φ = 697698240.

The previous prime is 1399406857. The next prime is 1399406959. The reversal of 1399406938 is 8396049931.

It can be written as a sum of positive squares in 2 ways, for example, as 1171487529 + 227919409 = 34227^2 + 15097^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1001743 + ... + 1003138.

Almost surely, 2^1399406938 is an apocalyptic number.

1399406938 is a deficient number, since it is larger than the sum of its proper divisors (705719162).

1399406938 is a wasteful number, since it uses less digits than its factorization.

1399406938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2005232.

The product of its (nonzero) digits is 1259712, while the sum is 52.

The square root of 1399406938 is about 37408.6479039272. The cubic root of 1399406938 is about 1118.5309550323.

The spelling of 1399406938 in words is "one billion, three hundred ninety-nine million, four hundred six thousand, nine hundred thirty-eight".