1997154 has 24 divisors (see below), whose sum is σ = 4358172. Its totient is φ = 660960.

The previous prime is 1997141. The next prime is 1997161. The reversal of 1997154 is 4517991.

It can be written as a sum of positive squares in 2 ways, for example, as 1159929 + 837225 = 1077^2 + 915^2 .

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2952 + ... + 3564.

2^1997154 is an apocalyptic number.

1997154 is an abundant number, since it is smaller than the sum of its proper divisors (2361018).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1997154 is a wasteful number, since it uses less digits than its factorization.

1997154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802 (or 799 counting only the distinct ones).

The product of its digits is 11340, while the sum is 36.

The square root of 1997154 is about 1413.2069912083. The cubic root of 1997154 is about 125.9323143647.

The spelling of 1997154 in words is "one million, nine hundred ninety-seven thousand, one hundred fifty-four".