1649397 has 8 divisors (see below), whose sum is σ = 2213344. Its totient is φ = 1092528.

The previous prime is 1649393. The next prime is 1649411. The reversal of 1649397 is 7939461.

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

It is not a de Polignac number, because 1649397 - 2² = 1649393 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1649393) 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, 1198 + ... + 2175.

It is an arithmetic number, because the mean of its divisors is an integer number (276668).

2^1649397 is an apocalyptic number.

It is an amenable number.

1649397 is a deficient number, since it is larger than the sum of its proper divisors (563947).

1649397 is a wasteful number, since it uses less digits than its factorization.

1649397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3539.

The product of its digits is 40824, while the sum is 39.

The square root of 1649397 is about 1284.2885189863. The cubic root of 1649397 is about 118.1521784555.

Subtracting 1649397 from its reverse (7939461), we obtain a square (6290064 = 2508²).

The spelling of 1649397 in words is "one million, six hundred forty-nine thousand, three hundred ninety-seven".