1428157649 has 4 divisors (see below), whose sum is σ = 1428289536. Its totient is φ = 1428025764.

The previous prime is 1428157637. The next prime is 1428157673. The reversal of 1428157649 is 9467518241.

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: 9467518241 = 397 ⋅23847653.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1428157649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1428157949) 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, 48089 + ... + 71894.

It is an arithmetic number, because the mean of its divisors is an integer number (357072384).

Almost surely, 2^1428157649 is an apocalyptic number.

It is an amenable number.

1428157649 is a deficient number, since it is larger than the sum of its proper divisors (131887).

1428157649 is a wasteful number, since it uses less digits than its factorization.

1428157649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131886.

The product of its digits is 483840, while the sum is 47.

The square root of 1428157649 is about 37790.9731152824. The cubic root of 1428157649 is about 1126.1391323249.

The spelling of 1428157649 in words is "one billion, four hundred twenty-eight million, one hundred fifty-seven thousand, six hundred forty-nine".