1396571820 has 288 divisors, whose sum is σ = 4825691136. Its totient is φ = 295488000.

The previous prime is 1396571819. The next prime is 1396571849. The reversal of 1396571820 is 281756931.

1396571820 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×1396571820² = 3900825696836224800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 9248745 + ... + 9248895.

It is an arithmetic number, because the mean of its divisors is an integer number (16755872).

Almost surely, 2^1396571820 is an apocalyptic number.

1396571820 is a gapful number since it is divisible by the number (10) 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 1396571820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2412845568).

1396571820 is an abundant number, since it is smaller than the sum of its proper divisors (3429119316).

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

1396571820 is a wasteful number, since it uses less digits than its factorization.

1396571820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269 (or 248 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 1396571820 is about 37370.7348067977. The cubic root of 1396571820 is about 1117.7750845499.

The spelling of 1396571820 in words is "one billion, three hundred ninety-six million, five hundred seventy-one thousand, eight hundred twenty".