1491645 has 16 divisors (see below), whose sum is σ = 2401920. Its totient is φ = 790464.

The previous prime is 1491643. The next prime is 1491649. The reversal of 1491645 is 5461941.

It is a happy number.

It is not a de Polignac number, because 1491645 - 2¹ = 1491643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3976 + ... + 4334.

It is an arithmetic number, because the mean of its divisors is an integer number (150120).

2^1491645 is an apocalyptic number.

1491645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1491645 is a deficient number, since it is larger than the sum of its proper divisors (910275).

1491645 is a wasteful number, since it uses less digits than its factorization.

1491645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644.

The product of its digits is 4320, while the sum is 30.

The square root of 1491645 is about 1221.3291939522. The cubic root of 1491645 is about 114.2584931448.

The spelling of 1491645 in words is "one million, four hundred ninety-one thousand, six hundred forty-five".