1397449091 has 8 divisors (see below), whose sum is σ = 1416273600. Its totient is φ = 1378653120.

The previous prime is 1397449087. The next prime is 1397449121. The reversal of 1397449091 is 1909447931.

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 1397449091 - 2² = 1397449087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1397449591) 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, 102695 + ... + 115503.

It is an arithmetic number, because the mean of its divisors is an integer number (177034200).

Almost surely, 2^1397449091 is an apocalyptic number.

1397449091 is a deficient number, since it is larger than the sum of its proper divisors (18824509).

1397449091 is a wasteful number, since it uses less digits than its factorization.

1397449091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14269.

The product of its (nonzero) digits is 244944, while the sum is 47.

The square root of 1397449091 is about 37382.4703704825. The cubic root of 1397449091 is about 1118.0090828785.

The spelling of 1397449091 in words is "one billion, three hundred ninety-seven million, four hundred forty-nine thousand, ninety-one".