1394421408 has 36 divisors (see below), whose sum is σ = 3965386698. Its totient is φ = 464807040.

The previous prime is 1394421407. The next prime is 1394421409. The reversal of 1394421408 is 8041244931.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1394421407) and next prime (1394421409).

It can be written as a sum of positive squares in only one way, i.e., 794563344 + 599858064 = 28188^2 + 24492^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×1394421408² = 3888822126177404928, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1394421403) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2420583 + ... + 2421158.

Almost surely, 2^1394421408 is an apocalyptic number.

1394421408 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1394421408 is an abundant number, since it is smaller than the sum of its proper divisors (2570965290).

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

1394421408 is a wasteful number, since it uses less digits than its factorization.

1394421408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4841757 (or 4841746 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 1394421408 is about 37341.9523860229. The cubic root of 1394421408 is about 1117.2010809582.

The spelling of 1394421408 in words is "one billion, three hundred ninety-four million, four hundred twenty-one thousand, four hundred eight".