1997402 has 16 divisors (see below), whose sum is σ = 3294432. Its totient is φ = 900720.

The previous prime is 1997351. The next prime is 1997407. The reversal of 1997402 is 2047991.

It is a super-2 number, since 2×1997402² = 7979229499208, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1997407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3308 + ... + 3864.

It is an arithmetic number, because the mean of its divisors is an integer number (205902).

2^1997402 is an apocalyptic number.

1997402 is a deficient number, since it is larger than the sum of its proper divisors (1297030).

1997402 is a wasteful number, since it uses less digits than its factorization.

1997402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 733.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 1997402 is about 1413.2947321773. The cubic root of 1997402 is about 125.9375267688.

The spelling of 1997402 in words is "one million, nine hundred ninety-seven thousand, four hundred two".