397814661 has 24 divisors (see below), whose sum is σ = 604371456. Its totient is φ = 251802720.

The previous prime is 397814657. The next prime is 397814687. The reversal of 397814661 is 166418793.

It is a happy number.

It is not a de Polignac number, because 397814661 - 2² = 397814657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397814621) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1336 + ... + 28238.

It is an arithmetic number, because the mean of its divisors is an integer number (25182144).

Almost surely, 2^397814661 is an apocalyptic number.

397814661 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

397814661 is a deficient number, since it is larger than the sum of its proper divisors (206556795).

397814661 is a wasteful number, since it uses less digits than its factorization.

397814661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26993 (or 26990 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 397814661 is about 19945.2917000479. The cubic root of 397814661 is about 735.4620390749.

The spelling of 397814661 in words is "three hundred ninety-seven million, eight hundred fourteen thousand, six hundred sixty-one".