396538740 has 240 divisors, whose sum is σ = 1411576320. Its totient is φ = 92378880.

The previous prime is 396538693. The next prime is 396538741. The reversal of 396538740 is 47835693.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (396538741) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 399645 + ... + 400635.

It is an arithmetic number, because the mean of its divisors is an integer number (5881568).

Almost surely, 2^396538740 is an apocalyptic number.

396538740 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 396538740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (705788160).

396538740 is an abundant number, since it is smaller than the sum of its proper divisors (1015037580).

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

396538740 is a wasteful number, since it uses less digits than its factorization.

396538740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1044 (or 1033 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The square root of 396538740 is about 19913.2804931784. The cubic root of 396538740 is about 734.6749082942.

The spelling of 396538740 in words is "three hundred ninety-six million, five hundred thirty-eight thousand, seven hundred forty".