397784555 has 32 divisors (see below), whose sum is σ = 556416000. Its totient is φ = 267380352.

The previous prime is 397784539. The next prime is 397784587. The reversal of 397784555 is 555487793.

397784555 = 235² + 236² + ... + 1064².

It is a cyclic number.

It is not a de Polignac number, because 397784555 - 2⁴ = 397784539 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 397784497 and 397784506.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 432386 + ... + 433304.

It is an arithmetic number, because the mean of its divisors is an integer number (17388000).

Almost surely, 2^397784555 is an apocalyptic number.

397784555 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

397784555 is a deficient number, since it is larger than the sum of its proper divisors (158631445).

397784555 is a wasteful number, since it uses less digits than its factorization.

397784555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1163.

The product of its digits is 5292000, while the sum is 53.

The square root of 397784555 is about 19944.5369713112. The cubic root of 397784555 is about 735.4434857293.

The spelling of 397784555 in words is "three hundred ninety-seven million, seven hundred eighty-four thousand, five hundred fifty-five".