2151490 has 16 divisors (see below), whose sum is σ = 4224960. Its totient is φ = 782320.

The previous prime is 2151473. The next prime is 2151497. The reversal of 2151490 is 941512.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (2151497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9670 + ... + 9889.

It is an arithmetic number, because the mean of its divisors is an integer number (264060).

2^2151490 is an apocalyptic number.

2151490 is a deficient number, since it is larger than the sum of its proper divisors (2073470).

2151490 is a wasteful number, since it uses less digits than its factorization.

2151490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19577.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 2151490 is about 1466.7958276461. The cubic root of 2151490 is about 129.0960964955.

Adding to 2151490 its sum of digits (22), we get a palindrome (2151512).

The spelling of 2151490 in words is "two million, one hundred fifty-one thousand, four hundred ninety".