1405988 has 6 divisors (see below), whose sum is σ = 2460486. Its totient is φ = 702992.

The previous prime is 1405979. The next prime is 1405997. The reversal of 1405988 is 8895041.

It is an interprime number because it is at equal distance from previous prime (1405979) and next prime (1405997).

It can be written as a sum of positive squares in only one way, i.e., 1036324 + 369664 = 1018^2 + 608^2 .

It is a super-2 number, since 2×1405988² = 3953604512288, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 175745 + ... + 175752.

It is an arithmetic number, because the mean of its divisors is an integer number (410081).

2^1405988 is an apocalyptic number.

It is an amenable number.

1405988 is a deficient number, since it is larger than the sum of its proper divisors (1054498).

1405988 is a wasteful number, since it uses less digits than its factorization.

1405988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351501 (or 351499 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 1405988 is about 1185.7436485177. The cubic root of 1405988 is about 112.0281604360.

The spelling of 1405988 in words is "one million, four hundred five thousand, nine hundred eighty-eight".