1421788 has 12 divisors (see below), whose sum is σ = 2529352. Its totient is φ = 699120.

The previous prime is 1421779. The next prime is 1421801. The reversal of 1421788 is 8871241.

It is a super-2 number, since 2×1421788² = 4042962233888, which contains 22 as substring.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 2670 + ... + 3157.

2^1421788 is an apocalyptic number.

It is an amenable number.

1421788 is a deficient number, since it is larger than the sum of its proper divisors (1107564).

1421788 is a wasteful number, since it uses less digits than its factorization.

1421788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5892 (or 5890 counting only the distinct ones).

The product of its digits is 3584, while the sum is 31.

The square root of 1421788 is about 1192.3875209008. The cubic root of 1421788 is about 112.4462426292.

It can be divided in two parts, 1421 and 788, that added together give a square (2209 = 47²).

The spelling of 1421788 in words is "one million, four hundred twenty-one thousand, seven hundred eighty-eight".