1981430 has 16 divisors (see below), whose sum is σ = 3891024. Its totient is φ = 720480.

The previous prime is 1981429. The next prime is 1981457. The reversal of 1981430 is 341891.

It is a super-3 number, since 3×1981430³ = 23337667996890621000, which contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1981430.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8897 + ... + 9116.

It is an arithmetic number, because the mean of its divisors is an integer number (243189).

2^1981430 is an apocalyptic number.

1981430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1981430 is a deficient number, since it is larger than the sum of its proper divisors (1909594).

1981430 is a wasteful number, since it uses less digits than its factorization.

1981430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18031.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 1981430 is about 1407.6327646087. The cubic root of 1981430 is about 125.6009462787.

The spelling of 1981430 in words is "one million, nine hundred eighty-one thousand, four hundred thirty".