1349890657 has 4 divisors (see below), whose sum is σ = 1350114480. Its totient is φ = 1349666836.

The previous prime is 1349890639. The next prime is 1349890667. The reversal of 1349890657 is 7560989431.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7560989431 = 2917 ⋅2592043.

It is a cyclic number.

It is not a de Polignac number, because 1349890657 - 2¹⁵ = 1349857889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1349890667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102607 + ... + 115012.

It is an arithmetic number, because the mean of its divisors is an integer number (337528620).

Almost surely, 2^1349890657 is an apocalyptic number.

It is an amenable number.

1349890657 is a deficient number, since it is larger than the sum of its proper divisors (223823).

1349890657 is an equidigital number, since it uses as much as digits as its factorization.

1349890657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223822.

The product of its (nonzero) digits is 1632960, while the sum is 52.

The square root of 1349890657 is about 36740.8581418562. The cubic root of 1349890657 is about 1105.1796100416.

The spelling of 1349890657 in words is "one billion, three hundred forty-nine million, eight hundred ninety thousand, six hundred fifty-seven".