399419748 has 480 divisors, whose sum is σ = 1457111040. Its totient is φ = 92378880.

The previous prime is 399419693. The next prime is 399419749. The reversal of 399419748 is 847914993.

It is a super-2 number, since 2×399419748² = 319072270184767008, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 399419694 and 399419703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399419749) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 12884493 + ... + 12884523.

It is an arithmetic number, because the mean of its divisors is an integer number (3035648).

Almost surely, 2^399419748 is an apocalyptic number.

399419748 is a gapful number since it is divisible by the number (38) 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 399419748, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (728555520).

399419748 is an abundant number, since it is smaller than the sum of its proper divisors (1057691292).

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

399419748 is a wasteful number, since it uses less digits than its factorization.

399419748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109 (or 98 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 54.

The square root of 399419748 is about 19985.4884353623. The cubic root of 399419748 is about 736.4498495392.

The spelling of 399419748 in words is "three hundred ninety-nine million, four hundred nineteen thousand, seven hundred forty-eight".