1421690 has 8 divisors (see below), whose sum is σ = 2559060. Its totient is φ = 568672.

The previous prime is 1421689. The next prime is 1421711. The reversal of 1421690 is 961241.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1399489 + 22201 = 1183^2 + 149^2 .

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

It is a super-2 number, since 2×1421690² = 4042404912200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71075 + ... + 71094.

2^1421690 is an apocalyptic number.

1421690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1421690 is a deficient number, since it is larger than the sum of its proper divisors (1137370).

1421690 is a wasteful number, since it uses less digits than its factorization.

1421690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142176.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1421690 is about 1192.3464261698. The cubic root of 1421690 is about 112.4436590315.

The spelling of 1421690 in words is "one million, four hundred twenty-one thousand, six hundred ninety".