1390844397 has 8 divisors (see below), whose sum is σ = 1854925056. Its totient is φ = 926996672.

The previous prime is 1390844387. The next prime is 1390844447. The reversal of 1390844397 is 7934480931.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1390844397 - 2⁶ = 1390844333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1390844387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43788 + ... + 68549.

It is an arithmetic number, because the mean of its divisors is an integer number (231865632).

Almost surely, 2^1390844397 is an apocalyptic number.

It is an amenable number.

1390844397 is a deficient number, since it is larger than the sum of its proper divisors (464080659).

1390844397 is a wasteful number, since it uses less digits than its factorization.

1390844397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116467.

The product of its (nonzero) digits is 653184, while the sum is 48.

The square root of 1390844397 is about 37294.0262910831. The cubic root of 1390844397 is about 1116.2449705355.

The spelling of 1390844397 in words is "one billion, three hundred ninety million, eight hundred forty-four thousand, three hundred ninety-seven".