1722988 has 6 divisors (see below), whose sum is σ = 3015236. Its totient is φ = 861492.

The previous prime is 1722983. The next prime is 1722989. The reversal of 1722988 is 8892271.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1722983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215370 + ... + 215377.

2^1722988 is an apocalyptic number.

It is an amenable number.

1722988 is a deficient number, since it is larger than the sum of its proper divisors (1292248).

1722988 is a wasteful number, since it uses less digits than its factorization.

1722988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430751 (or 430749 counting only the distinct ones).

The product of its digits is 16128, while the sum is 37.

The square root of 1722988 is about 1312.6263748683. The cubic root of 1722988 is about 119.8838691312.

It can be divided in two parts, 172 and 2988, that added together give a triangular number (3160 = T₇₉).

The spelling of 1722988 in words is "one million, seven hundred twenty-two thousand, nine hundred eighty-eight".