1490721 has 8 divisors (see below), whose sum is σ = 2092320. Its totient is φ = 941472.

The previous prime is 1490717. The next prime is 1490729. The reversal of 1490721 is 1270941.

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

It is not a de Polignac number, because 1490721 - 2² = 1490717 is a prime.

It is an Ulam number.

It is an alternating number because its digits alternate between odd and even.

1490721 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1490691 and 1490700.

It is not an unprimeable number, because it can be changed into a prime (1490729) 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, 13020 + ... + 13133.

It is an arithmetic number, because the mean of its divisors is an integer number (261540).

2^1490721 is an apocalyptic number.

It is an amenable number.

1490721 is a deficient number, since it is larger than the sum of its proper divisors (601599).

1490721 is a wasteful number, since it uses less digits than its factorization.

1490721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26175.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 1490721 is about 1220.9508589620. The cubic root of 1490721 is about 114.2348957843.

It can be divided in two parts, 1490 and 721, that added together give a triangular number (2211 = T₆₆).

The spelling of 1490721 in words is "one million, four hundred ninety thousand, seven hundred twenty-one".