397782780 has 24 divisors (see below), whose sum is σ = 1113791952. Its totient is φ = 106075392.

The previous prime is 397782739. The next prime is 397782799. The reversal of 397782780 is 87287793.

It is a super-2 number, since 2×397782780² = 316462280129056800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3314797 + ... + 3314916.

It is an arithmetic number, because the mean of its divisors is an integer number (46407998).

Almost surely, 2^397782780 is an apocalyptic number.

397782780 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

397782780 is an abundant number, since it is smaller than the sum of its proper divisors (716009172).

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

397782780 is a wasteful number, since it uses less digits than its factorization.

397782780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6629725 (or 6629723 counting only the distinct ones).

The product of its (nonzero) digits is 1185408, while the sum is 51.

The square root of 397782780 is about 19944.4924728608. The cubic root of 397782780 is about 735.4423918254.

The spelling of 397782780 in words is "three hundred ninety-seven million, seven hundred eighty-two thousand, seven hundred eighty".