1997378900 has 36 divisors (see below), whose sum is σ = 4728343200. Its totient is φ = 726319200.

The previous prime is 1997378869. The next prime is 1997378921. The reversal of 1997378900 is 98737991.

It is a congruent 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, 906800 + ... + 908999.

Almost surely, 2^1997378900 is an apocalyptic number.

1997378900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1997378900 is an abundant number, since it is smaller than the sum of its proper divisors (2730964300).

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

1997378900 is a wasteful number, since it uses less digits than its factorization.

1997378900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1815824 (or 1815817 counting only the distinct ones).

The product of its (nonzero) digits is 857304, while the sum is 53.

The square root of 1997378900 is about 44692.0451534722. The cubic root of 1997378900 is about 1259.3704127683.

The spelling of 1997378900 in words is "one billion, nine hundred ninety-seven million, three hundred seventy-eight thousand, nine hundred".